"Possible legitimate" based on which universal rulebook?
Well, I can't say I've ever read a single complaint about missing mouse control on an iPad but I'll take your word for it. I've seen some comments about lack of touch on a MB but very little. Then again my only AAPL/tech forum activity is here at MR where, I think, the majority around here seem to buy into iPads being best for taking in content via touch vs. MB's/computers being, generally, better for detailed productivity via mouse/keyboard.
Maybe one day USB-C will be as ubiquitous as USB-A, but, speaking in the most simplest sense, the issue is: there's
no noticeably felt gain over the large existing inventory of USB-A hardware that's already easily accessible in the homes & workplaces
for a vast majority of users. The cost and bother for workarounds to get to the same situation, but only after some non-insignificant cost & hassle, are a big deal to those for whom it's a big deal. Simple as that. Oh, and less ports for even less ease of work.
But, note, two key differences. 1) The removal was not so much to drive the future but was in response to an industry moving fast in ways complementary to the change such that the user didn't need to react as much and with pain to their convenience and in their pocketbook. Music was well-entrenched towards digital/download, and software updates were strongly headed towards downloads ilo CD-Rom. Apple nor anyone is helping by providing users USB hubs and dongles, or replacements for their large inventory of USB-A devices still very useful; it's up to the customers to buy more hardware and distribute it to various locations of need and/or carry it around with their "portable" product. Plus the reduced # of ports compounds things further. 2) Optical drives going away in lieu of downloads was apples replaced by oranges. USB-C replacing USB-A is...just a different apple or orange for a majority of users, where the to-be-discarded fruit was still pretty darn useful and available.
That's kind of like telling the athlete to ignore and play thru any pain. Just like one can't hide from love and attraction when they sense it, users feel pain when the adjustments are no longer as quick to take and easy as prior adjustments. If one of 12 eggs is broken when I return from the market, I can move on. When 1 of 2 breaks the morning I'm making breakfast for two, that's not as easy to brush off. After serial ports, firewire, superdrive, DVI, mini-DVI, magsafe, headphone jacks, USB-A, we're kind of getting down to 2 eggs in our basket, down from 1 dozen. More are gonna feel more pain the more courageous AAPL gets.
The "courageous" moves are resulting in diminishing returns but increasing pains for many. So that's a good thing?