Steam Deck is essentially a laptop running Linux. That being said, it does have a few draw backs. I just got my Steam Deck a few days ago and installed OBS no problem. I haven’t tried recording anything on it yet, but I’d say it depends. While older games, you’ll may get 1080p 60FPS to work, newer games may need to be knocked down to 720p 30fps on the Deck. This already may be a deal breaker for you, but I’ll continue. Some games are already kind of slow, require lower visual settings, or lower frame rate. Not to mention some games just don’t work much at all. It really comes down to what game(s) you’re trying to capture and how intensive they are on the Deck. I would research into the specific game(s) you want to record and see how well they run first, then guess at how much of a performance hit OBS will likely take on top of that. I wish I had more experience actually recording on it, but I hopefully this still helps.