There are plenty of people who can lift 800lbs in the idealized form of barbells along certain ranges of motion, such as the deadlift or squat. However, I sincerely doubt any human could lift 800lbs of dead weight gorilla, much less one that is struggling. The heaviest stones that have been lifted are in the mid 600# range, and lifting a stone is easier than lifting an equivalent weight of floppy body.

I’m sure it’s sufficient for two players, but I don’t know how the game rearranges the interface with four. It might be a little crowded.

I can confirm that Barony is a fun couch coop experience for two on a steam deck, so long as you are prepared to die and have to start over a lot. It might be tricky with four players, as there is a lot of inventory menuing. You might need a really large screen.