Not had any issues with scaling moving from an 8+ to a 12. It’s much easier to text on the 12 and as I am not directly comparing what is on the screen, it’s not noticeably better or worse.
Yes it is. Went from the 11 to the 12 and there’s less real estate and it is noticeable. But it’s worth it for oled and I zoom out to 85% on safari to compensate. Overall it doesn’t bother me as much as I thought it would.