Not sure why people here are all arguing about why you would want to use discs, rather than the fact that the Steam Deck is a PC, of course you can absolutely used discs. All you need to do is plug in a USB disc drive, and it’s ready to go. I’ve installed a bunch of my older PC games from CD/DVD that way, and it works great. Even under Linux, applications like Lutris make installing Windows game discs pretty easy, and once they’re installed, you’re ready to go.
I use it as my only personal (i.e. not work or shared) machine, and it is absolutely great. I expected to be installing a ‘proper’ linux distro on an external drive for the docked use-case, and it has turned out to be completely unnecessary. For those things not available as flatpak, distrobox/podman has been great. (The only thing that slightly irks me that is missing is support for a printing service, but I haven’t tried that hard to fiddle with that, since I can do it from my phone on those rare occasions I need to.)
That shouldn’t be happening. I use mine as a desktop all the time, Firefox is pretty snappy, with a whole bunch of tabs open and extensions. Sorry I can’t give much more insight into what’s happening, but it’s definitely not right.
Don’t even need to remote in to anything, just store your working code on a network share