I had 3 white iBooks and a white MacBook, and all had yellowing problems. The yellowing/browning of those laptops was well documented at the time. (Remember the cottage industry of “magic erasers?)we've had white keyboards on Apple laptops and computers before. Perhaps before your time in the Apple-verse?
No issues with "Yellowing"
It’s just mind boggling to me that apple would go back to such an obviously poor design choice. Also don’t understand why they’d again drop the “air” name, as it’s a very strong brand. Or the wedge design, which is both iconic and excellent.
All in all, these mock ups look like they fell out of the ugly tree and hit every branch on the way down. Even worse than the M1 iMacs, and that’s really saying something.