I apologize for the late reply, the other commenter is correct as well, Bazzite comes out of the box in desktop mode, if you’ve ever used plasma before, it’s a lot like that. For .exe programs I use wine, and haven’t had that let me down yet for the most part. Im fairly certain Bazzite does use flatpaks, but it does also have also Discover baked in.
Honestly, I compare it strongly to using the steam deck desktop mode.
The Steam Deck and it’s desktop mode are why I decided to try jumping head first into a single boot of Bazzite on my main computer, it’s basically like using a Steam deck, just across four monitors, a year in and I haven’t looked back.