Out of curiosity, what content are you looking for? Discovery on Lemmy can be a problem, but sometimes the communities are there and even active, just buried.
But may I also suggest searching by Top Day/12-hour/6-hour to see the most active posts. Lemmy's scaled algorithm still doesn't get it quite right IMO.
I'll just add that another, albeit smaller, category of games that don't work are really new, demanding titles. There's not a lot of them for now, but naturally the deck wasn't the most powerful device to begin with and over time less titles will work well.
Starfield was pointed out to me as an example of one that can't run on the deck for performance reasons (not that Bethesda is known for their optimization) and BG3 was only barely playable at the lowest settings in the more demanding areas of the game (i.e. Act 3).
That said, for its price point, and considering most games are using the proton compatibility later, I was actually very impressed with its performance.