Since there is ‘archinstall’ setting up arch is really straight forward. Just Boot from stick, type archinstall and fill up all points, done.

From shell

winget install --id=Mozilla.Firefox -e

For example

I didnt watch the full Video, but all games i saw in the clip are native Windows games with no offical port for linux

But Windows is usally the system the games are optimized for. Its impressiv how well proton/wine work these days :)

If its only cuz of the unlocked bootloader have a look at DivestOS, Graphene or Calyx

Edit: i use my ING Banking App on my Pixel 6 with graphene and before on my OP6 with Divest

For Browser there are actually two YouTube Frontends: piped and invidious