The problem is it's entirely possible the obstacle detection is un-fixable without swapping out the sensor suite the Tesla ships with. Tesla is quite clearly expecting the problem to be solvable with that sensor suite alone (this is more-or-less the line I was given by a Tesla seller when I was shopping for a car), so it's not going to be in the T-sheet for them to recall every Tesla on the road to fit a LIDAR to them, assuming that's at all feasible.