I got your point, and I agree a few generation-defining games are notoriously more demanding and one shouldn't expect a great experience on console, but there's a limit to that downgrade. 540p 15FPS is below the bare minimum something ought to run, if it gets that bad, maybe it's better to just outright say "you need a PS4 Pro / Xbox One X or newer to play, sorry". I say this as a PC gamer with no current-gen (PS4/X1) or next-gen console at all (except the Switch if that counts in this context).

And IIRC Just Cause 3 was just bad all around, the PC port was extremely buggy as well.