Even on windows, its hilarious to compare the RAM Discord uses. I caught the native app doing 2+gb, and Firefox beating it by… 100mb? I didnt compare ram usage too hard on my Stram Deck though between Flatpak and Firefox, but I expect firefox to be a bit better with its addons/plugins, like it was on windows
For what its worth, some Samsung phones can stop charging while the plug is in, while also not disconnecting anything on a USB dock (such as internet)