Do you really use your back buttons?

I am basically new to controllers, as I’ve been gaming my whole life with keyboard and mouse and never grew up with a console at home like most people here. I’m just curious how do you utilize the four back buttons on Steamdeck.

I only use it as mouse buttons when I’m at the desktop mode because I find it very awkward to have my left click button to be an RT.

Then all of my games are just using the standard layout of controls. I want to make it muscle memory all button placement so I really not using the back buttons, at least for now. I’m not that good at controllers yet.