I understand fragmentation here, as you can get what you need in a format that works well-enough.
Different package formats often have technical differences. Recently I had the choice to use something from a flatpak to reduce lib32 dependencies on my system… but I didn’t go with that as the other dependencies it needed (openGL, graphics driver etc) were redundant thanks to sandboxing (~2GB download!).
Anything native from itch, GOG, or humble doesn’t really ‘install’ but rather they are just extracted… so the files should be what it is (portable, except game saves/user data likely won’t be). This allows you to run it off of a slower+larger-capacity drive.
EDIT: Also if you need to compile it, probably will also just compiled to where you put it (to a bin folder).
Non-system stuff like this is more viable for things that you don’t need updated frequently/ever (particularly games/software post-development). For sure most-of-the-time the best experience is via your package manager.
At this point I think the greater issue is that fans didn’t learn from Starfield (or FO76, arguably FO4/Skyrim too at least enough for a trend line if you care about the RPG aspect of it). Why would Bethesda ever change course if they continue raking in money? It really seems like people aren’t even waiting for reviews.
I was going to say that it’d be a coin flip on if this actually has the same re-occurring bugs that the UOP fixed, though I see that it’s going to be 3rd-party so that may change the odds a bit.