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Per above, it's all about what's important to someone. "I shouldn't buy something because it's old" is actually an example of emotional reasoning, so I have to give kudos to people who are able to overcome that kind of cognitive bias. (I can't, personally, even as someone who recognizes it.) If a 2015 model makes someone happier, and that person truly understands the pros and cons, far be it for me to tell them they shouldn't buy it.

Don’t get me wrong. I considered buying the 2015 model in 2016. I loved my dad’s 2015 MBP. Mag-safe, the I/O, battery life and yes even the lit up logo were all things I really liked. The problem was spending over $2k for a machine which is no longer the latest. I ended spending $3k and for that I expect something that will have resale value. While they really shouldn’t have killed MagSafe it is pretty convenient to be able to charge from either side. The potential of TB3, the P3 display and the stupid fast SSD (for 2016) also had me sold. These drives were really impressive when they launched. Of course SSDs will keep improving but the ones in the 2016 models were substantially faster than the 2015s. Like ridiculously fast. While High Sierra has increased boot time by several seconds, I couldn’t believe this machine was ready to go in about 15 seconds after signing in. I was coming from a machine that took about a minute before before I got to the desktop. I understand that the difference isn’t as dramatic from someone coming from a 2014 rMBP and honestly if I had one or a 2015 model, I would’ve never bought the 2016. I’ll upgrade to a new 15” once these have hexacore core i9s and 32GB or LPDDR4 RAM. They’ll have the CPUs fairly soon but I expect the RAM in 2019 or 2020. My AppleCare expires 12/19 so I’ll probably sell it before then before it’s value is well under $1000. If the resale is too low, I’ll just keep it as a backup. It’s always good to have something in case you have problems with a new machine. I bought a cheap Windows notebook recently just to have something useable in case I send the MBP for a warranty repair.
 
Don’t get me wrong. I considered buying the 2015 model in 2016. I loved my dad’s 2015 MBP. Mag-safe, the I/O, battery life and yes even the lit up logo were all things I really liked. The problem was spending over $2k for a machine which is no longer the latest. I ended spending $3k and for that I expect something that will have resale value. While they really shouldn’t have killed MagSafe it is pretty convenient to be able to charge from either side. The potential of TB3, the P3 display and the stupid fast SSD (for 2016) also had me sold. These drives were really impressive when they launched. Of course SSDs will keep improving but the ones in the 2016 models were substantially faster than the 2015s. Like ridiculously fast. While High Sierra has increased boot time by several seconds, I couldn’t believe this machine was ready to go in about 15 seconds after signing in. I was coming from a machine that took about a minute before before I got to the desktop. I understand that the difference isn’t as dramatic from someone coming from a 2014 rMBP and honestly if I had one or a 2015 model, I would’ve never bought the 2016. I’ll upgrade to a new 15” once these have hexacore core i9s and 32GB or LPDDR4 RAM. They’ll have the CPUs fairly soon but I expect the RAM in 2019 or 2020. My AppleCare expires 12/19 so I’ll probably sell it before then before it’s value is well under $1000. If the resale is too low, I’ll just keep it as a backup. It’s always good to have something in case you have problems with a new machine. I bought a cheap Windows notebook recently just to have something useable in case I send the MBP for a warranty repair.

Yeah, my 2017 is basically my backup machine. (I'm about to turn into a giant Postgres server, which is more than a little ridiculous.)

There's no arguing with the performance improvement on the 2017 models, or with the display. Both are clear and noticeable improvements. And like you, once 32GB is an option, I'll bite the bullet and make the swap.

Of course, two weeks later, my dog will be walking between the laptop and the sofa, and he'll yank the USB-C cord, causing the $3200 machine to come crashing to the ground.
 
Obvious counter: They could have kept all of the 2015 model's ports, keyboard, MagSafe, etc, but replaced Thunderbolt 2 with Thunderbolt 3 and called it a day. I really wish they had done that. :|

True, but then you're still dealing with a bunch of different cables. Now, you don't even have to worry about which port you plug your charger in to (on the 15" at least).
 
Yeah, my 2017 is basically my backup machine. (I'm about to turn into a giant Postgres server, which is more than a little ridiculous.)

There's no arguing with the performance improvement on the 2017 models, or with the display. Both are clear and noticeable improvements. And like you, once 32GB is an option, I'll bite the bullet and make the swap.

Of course, two weeks later, my dog will be walking between the laptop and the sofa, and he'll yank the USB-C cord, causing the $3200 machine to come crashing to the ground.

I have a cat so I don’t have to worry about her bringing down a 4lb object but dogs are definitely a different story!
 
True, but then you're still dealing with a bunch of different cables. Now, you don't even have to worry about which port you plug your charger in to (on the 15" at least).
You act like all of your existing peripherals just magically become USB Type-C. Not the case. I have a massive collection of various peripherals I've collected for all sorts of things over the years, and having to carry around a pile of dongles or a hub isn't what I'd call convenient. What's convenient is to have all the ports you need right on the device. I understand not having an RJ-45 jack on it, because those things are huge, but there's no reason to ditch the rest of them. Apple jumped the gun a bit. Someday, we'll all have stacks of USB Type-C devices, but I don't think any of us are there yet, or even close.
 
You act like all of your existing peripherals just magically become USB Type-C. Not the case. I have a massive collection of various peripherals I've collected for all sorts of things over the years, and having to carry around a pile of dongles or a hub isn't what I'd call convenient. What's convenient is to have all the ports you need right on the device. I understand not having an RJ-45 jack on it, because those things are huge, but there's no reason to ditch the rest of them. Apple jumped the gun a bit. Someday, we'll all have stacks of USB Type-C devices, but I don't think any of us are there yet, or even close.

Why would I be carrying around a pile of dongles or even a hub? That all stays at home.
 
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