Back in the day when I was running Gentoo, in the long long ago, Firefox was one of the few things I installed as a binary, since compiling it took hours. Compiling it every time there was an update would have driven me crazy. From what I gather this is still true for most users. Yeah, go for the Flatpak if at all possible.
I bought Tales of Maj’Eyal from GOG and have been playing the Linux port. Yeah, I’d say it’s my favorite. Even if I hate it sometimes.