Im also running a pi4 with docker containers but also my nextcloud instance. Been feeling it's a bit sluggish at times so I recently ordered a cheap optiplex micro, and some upgrades for the ram, ssd and cpu. The pi4 will only be used for pi-hole now.

Not being able to use it with a Jagex account is a bummer.

It is a HDOS client which utilizes the same plugin system as Runelite, ie. They will share plugins

Those distos are for professional use cases mostly. Fedora is fine and there is no need to worry.

I'm all for using Debian and such, and I think out of all the new and hip things people brag about, using Flatpak is the most useful thing for the average user experience and worth checking out. Everything (almost) else is just extra.

I'm running pixel 4a for this reason (also the support for grapheneos)