So imho this SX os needed a lot more time in development. I've tried 4 different micro sd cards, formatted exfat and fat32, formatted by both my pc (windows 10) and the Switch itself. And it just doesn't work. Some games will show up on one card but not another, not too big a deal. But the issue is, several games will only load if they are trimmed. The problem is, they also always crash the whole system if trimmed. Trying them on all 4 sd cards, regardless of formatting, untrimmed always without fail gives me the "game card could not be read" error, and trimmed they always crash without fail quite early on.
Ittle Dew 2+ will only load if trimmed, and always crashes when I try to enter a different screen from the one you start playing on.
Kirby and Penny punching Princess likewise, only load if trimmed, but both crash on loading screens.
Mario + Rabbids, trimmed only, crashes during the opening video.
I've tried multiple files for each from different locations and even self made backup in one case, to no avail.