Well, most things probably get heavy if you’re holding them for many hours. It all depends on your posture and seating arrangement. Can you lean on a table or desk? Playing on transit? Are you sitting on the couch? Standing somewhere? If you can find ways to lean your arms and hands on something, it can help a lot.

There are also lots of cases and stands that can prop up the Steam Deck so you can play with a controller, which is a bit lighter. You have lots of options.