First, you can totally make a steam library on a portable device like a microsd or an external drive (I do and I play on different places with the same drive), and play it on any device running steam.

And don't start the "oh but you need steam installed", since with the proprietary sd, you gotta have the propriety device as well.

Second, sure I can just lavel it, a 3 seconds job. Don't you need the proprietary sd to come labeled as well? Also, I don't need to label anything, I have dozens of games there and select which one I want to play.

Your defense of OP's comment is also weird but that's okay, we all are always learning.

Each format of game has its own merits ans they are only better than another on an objective comparison, as for subjective, just use whatever you want.