The point is that the technology now is far past USB 2 (and has been for some time despite Apple's persistence on using Lightning with such slower speeds) and the only reason they have for not putting USB 3 in the 15s (non-Pro) is greed. They were forced by the EU to convert to USB-C, so it looks to me as if they did the absolute minimal amount of work and effort to be any more consumer-friendly than they have to be.
Your brain has been rotted by product marketing and tech consumer hype fanaticism.
If your phone is a year old then the only reasons to buy a new one are
I love how downvotes are used here to punish those you disagree with. Such fun. I guess this is now Reddit.