I'm usually the one making your argument. But in this case, if I bring that 17", it does everything. It runs OSX, it runs Linux, it runs windows NT4, XP, 7, and 10 even though it's not supposed to. It stands in to run our CNC mills. It keeps the large format imaging dept running. It goes in the field and runs autocad 12 and Inventor 2018. It recovers data off old tape drives from 30 years ago, it has 2TB of walking around storage, if you need to read any optical media ever burned, it takes 2min to pop that drive back in. It handles digital audio via built in fiber optic ins & outs in the media lab without needing a $500 external unit. It can plug into any network in the last 25 years when companies won't share wifi, it can connect to old weird firewire crap, it has a PCIExpress slot to connect to even weirder odd crap. whatever else you can imagine, and aside from that, I never have to carry around an adapter, bc this thing will connect to it. When I'm at the university, it has never once not appeared on the network and held its connection so the students can read & write to it like clockwork (should be a given, but you'd surprised). It acts as a media server and a portable backup hub. It has a high enough resolution screen that's big enough no one has to squint to read it, connects to every display new or old and doesn't gripe. It has magsafe which is the only reason it's survived this long, a battery that takes a minute to swap, a hinge that's still solid, and it has clever little details like charging indicators that are invisible until they turn on & things that impressed Steve at the time. You name it, but over the last 12 years, I have asked this clunky old machine that refuses to die to do every job that every PC in my company and school has had that I can think of, and there has never been an occasion where it's been unable to do so. When I say this thing is my swizz army knife, I mean, if there is a fire, the zippy new machines can burn, & I'll take the insurance $. This is the one thing I will grab, and I know I'll be good. I've bought literally thousands of computers over the years, nearly all are limited to being PC's. I've never owned anything else like this. If Apple made computers this versatile today, I'd replace every machine in my company with one.
It's obsolete.