I’d argue that searching around a slew of webpages to find a download button (without clicking an ad that imitates a download button), then running the .exe while making sure to uncheck the 4 or 5 pieces of adware they try to slip in without you noticing, then having to remember to update it manually now and then, is much more of a sketchy pain in the ass than running a single command to install everything from your kernel, to your web browser, all of which is tightly vetted and comes from a monitored set of servers.
Also, if you really want a “click to install” most DE’s have a software store that either acts as a frontend for your package manager, or just uses flatpaks.
I’d argue this is just what people are used to, and Windows has taught people that terminal=scary/hacky.
SteamDeck plays the same version of the game as a regular PC. Any mods that work on PC will work on SteamDeck (in theory), but seeing as the deck runs Linux, you’ll need to do some more tinkering with Wine and such.