And USB 3 is almost 2 decades old. How hard is it really to implement?

Because it's a feature vanishingly few users actually use. They have all the numbers, it's a very small niche of people that actually transfer things by cable. Most of that niche is photographers and videographers that shoot using their phone. For those people a Pro or Pro Max is non-negotiable already because it has the better camera. So they get the fancy camera and the fancy transfer speed. They even address this IN THE ANNOUNCEMENT VIDEO.

> why are you accepting this still

Because the only think I plug my phone into is my car, and I'm pretty sure that's still running at USB 1.x speeds.