There’s a considerable gap between ”what CAN happen” and ”what will USUALLY happen”.
I’ve never experienced, read or heard about accidentally bumping a lever being a problem. I’ve seen a guy distractedly pulling the wrong lever on a bike while installing the wheels and ejecting one piston. But I’ve also seen some calipers happily surviving brake actuation w/o rotor and w/o ejecting a piston - if pads are new and both pistons equally eager to move.
Wouldn’t dare to try it on my Formulas, as one piston is definitely getting a bit lazy.
So I guess repeated accidental bumping of the lever might eventually eject one piston and cause a troublesome issue. A possible but not likely scenario. Jamming just about anything between the pads will stop it from happening.