If you google top accessories for steam deck, you’ll get a ton of legit tech sites with nice lists. Not trying to be a jerk, but legit mean it in that they put some thought into it so it’ll be a good starting point. Then you can come back to here for some less common ideas.
Remember that this is a pc. If you plugged your microSd into a new laptop, it’s not going to ask you to format it. This isn’t like inserting a microSd into a Nintendo switch.
I miss the profile level icons we saw on the post game screen. No matter which mode I played, I was always making and seeing progress.
That’s the best deck accessory yet.