Because many years from now, when the wall has been painted over a dozen times, the paint will start cracking and someone will turn around and find their child peeling chunks of wall off the wall.
Hello fake wood grain wallpaper.
The rest of the wall is still intact, and this spot is fairly inconspicuous down by the baseboard, so for now, I am not fixing this. Instead I am going to be "fixing" this, probably by regluing this large paint chip back on the wall and then painting over it.
Someday when I've run out of projects and have nothing better to do, maybe I'll tackle repairing these walls the right way. You know, because that just sounds like so much fun.
Stupid old house. I love you, but you are definitely stupid.