It would be cool to be able to change the buttons on the far left of the action bar, and have the leftmost one just be your default left click. Pretty sure I literally never used my weapon attack with my Wizard. It was always either Fire Bolt or Ray of Frost if I needed an attack that didn't take spell slots, exactly as you're saying.
Also, as Rogue, there seems to be literally no reason to use the default attack, unless I'm missing something. You can always at least attempt to sneak attack something. If you can't sneak attack it, you'll just do a normal attack with your main weapon. I pretty much never just left clicked something even with my Rogue.
