I’m probably in the minority, but a thing I’d love to see is a much stronger flashlight. It’s silly, but the flashlight is something I use almost daily and having a more powerful one would be quite useful.
Despite boasting to have an intuitive UX, iOS can be very obscure regarding discoverability and exploration of features. Many features give no hints whatsoever of existing.
I have a Sofirn SP35 (USB-C charging, standard 21700 battery) and for about $40 it can be brighter than a car's low beams. r/flashlight's recommended lights is a solid place to start.