Upper Ball Joint came out while driving

Question. If he does actually weld the ball joints in. Wouldnt he have to hope that those ball joints last the life of the car. It would seem like alot of work to grind off the spotwelds later and also risk warping the control arm re-welding it, no ?

I would think cutting the spot welds with a die grinder and welding in new ball joints could be done repeatedly without damaging the arms.
There is a U shaped collar where the threads were.