I could not agree more! I've been sending feedback on this for years. It makes so much sense to have F3 and F4 keys bring up the app changer and home screen, especially since the other marked F row keys function as they should. When I first started using my magic keyboard with my iPad I thought the F3/4 keys were broken on mine, haha, since it made no sense that those two wouldn't work when the other ones would. And even now i still often forget and hit them trying to get the iOS equivalents of their mac functions.
Gonna go send feedback now that I've thought of it again...🙄