Everything except for the UHS-III part, yes. Some UHS-II stuff exists, but I think it’s limited to full-size SD cards right now, and the Deck only has a UHS-I bus.

The SD Association has this page explaining the speeds, and from what I can see, it’s just to guarantee speeds with certain bus types. Most devices currently use a UHS-I bus, and the older speed classes cap out at pretty pathetic numbers, so they’re kind of useless. For the steam deck, any of the higher-end cards are going to be about the same, and the IOPS are going to be more important in terms of loading times anyway.

2TB cards don’t exist quite yet.

The SDUC standard exists, but no, there aren’t any commercial 2TB microSD cards yet, though they’re coming.

I believe Kotor 1 doesn’t require a connection to play, and it’s more of a tactical game, so it’s not as annoying to play on a touch screen.

Honestly, once you get the basics down, it’s really easy to survive if you make a fort in a place that’s not close to anything dangerous. After that it’s mostly about learning how to build various fancy contraptions like mist generators and traps and stuff. Then you can start trying to survive in more dangerous areas.

Also, how mouse heavy is it? I like to be able to do keyboard shortcuts whenever possible.

Mostly everything has a keyboard shortcut, in fact before the UI got overhauled for the steam release, there was only keyboard shortcuts, no mouse input was allowed.

You’ll notice the smoothness for sure, I don’t like going below ~90 FPS.