the system does not aim to bring anything "to the masses" right now, considering the stage it's in; likely won't in the future either, as it's aimed at power users primarily

you can run steam in flatpak (it's there), chromium will probably come natively in not that long, it does not seem like that big of a nightmare besides the ways chromium is a nightmare in in general (you can run it in flatpak too right now)

there is no apparmor right now, but it'll come