Then there is literally no excuse for macs in 2016 or even 2019 to have only usb-c connectors other than sheer cluelessness and incompetence on the part of Apple.
Literally? To encourage adoption of USB-C and to prevent confusion of users wishing to "downgrade" their USB-C device to USB-A using yet another adapter type (Apple does not make USB-C female to USB-A male adapters currently).
We've been hearing that for 3 years. There's a handful of accessories that support USB-C at a huge markup. Even the current iPhones being sold in 2019 don't come with a USB-C cable. It is yet another of Apple's still-born standards, and like the others it will continue for several years with a sub-1% market share among the hardcore fans until Apple silently kills it off. 3 years in, USB-C seems less adopted than firewire did.
USB-A is ubiquitous. You expect to transition to USB-C overnight? How often do you replace all of your USB devices? I'd wager there are plenty of USB-A devices that last longer than your TV.
iPhones don't come with a USB-C cable because most don't need to connect to their laptop anymore. App store was removed from iTunes, AirDrop easily transfers files, and syncing happens over wifi. Fast charging is nice to have, but not critical in everyday situations. Apple is likely transitioning away from lightning, so they don't want users to get used to the fairly new USB-C to lightning cable.
And I see no data that suggests USB-C still has less adoption than Firewire. You just made that data up I believe.
At least firewire offered speed that video pros appreciated.
The ports support USB 3.1 Gen 2 AND TB3. Both are faster FW800 in real world conditions.
USB-C offers nothing of value.
Incorrect. For one, I can just carry one USB-C battery pack and I can charge all of my devices in my bag with it. My iPad Pro, my Switch, and my Macbook Pro. Of course there are a bunch of other benefits.
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So, just change the 2015 MacBook Pro's two TB to USB-C.
Plenty of professionals need more than two TB. And if you use USB-C for video out, you're stuck with only one TB port left. Not good.
I will never, and neither will most users including hard-core professionals, need to use "3xUSB-A devices and 3xUSB-C devices" the same time.
Use practical scenarios, not extreme examples, hyperbole to push your point across.
I'm not saying 6 device at one time. I'm saying one situation will be used, then eventually the other situation will happen.
This is a practical example: Right now, you likely have 3xUSB-A devices or more, so you buy one type of adapter that "upgrades" one of your USB-A to USB-C.
Then over time, you'll acquire 3xUSB-C devices or more (this is a sure thing) which then you have to buy another type of adapter to "downgrade" that USB-C to USB-A. You now have two different USB-A/USB-C adapters. If you hate adapters now, you'll hate this even more.
And you're still using one USB-C for video often. So to the user deciding whether they should buy a USB-A or USB-C version of a product, there's a chance that they'll probably stick with USB-A since they have more USB-A ports available. That means less USB-C adoption.
Falsely, you have added a power USB-C use - for power, "you'll likely be using 1 USB-C for power". I will be using the MagSafe.
No.
If they shipped a MagSafe port, that means they'll include the MagSafe charger with the MacBook which also means Apple wouldn't make an 87W USB-C charger. So the average MacBook Pro would need to carry a MagSafe and a USB-C iPad/iPhone charger, unless users buy a third party 87W USB-C charger or hope that they don't do any heavy work on the MacBook with a 30W charger. Apple wouldn't want this experience. Apple has always been in favor of doing things one way and not confusing the user with options.
Right now I can just carry an 87W to charge all of my Apple devices. Simple. And as Apple transitions away from lightning, it'll just get easier over time.
USB-A co-existing alongside USB-C is not a bad thing for portables' users. (Removing optical drives did not force a different kind of optical drive-format on the user.)
USB-A and USB-C creates confusion. You're upgrading USB-A with one adapter, downgrading USB-C with another adapter, and dealing with MagSafe or USB-C power.
You can't really compare this with optical drives. Apple didn't replace optical drives with something else. Use of optical drives simply declined.