I am guessing here, but from your comments it seems you may think that weight mapping is something you do over and over to fix flaws. That is not the case, weight mapping is a permenant fix, it replace the current joint handling. So once you have fixed something it stays fixed. But no worries you will be able to purchase figures and clothing that are already weight mapped and you dont have to do anything at all.

Life is hard, but what a ride.