To be fair to the OP, the lock shot is probably the most important shot on the game. I was in the first stream and it was the shot I was shooting for the most often. I'm not a great player and I need to go for multiball to start the reactors. Better players can lock balls but not start multiball until they are ready to destroy the reactor for multibsll.
It's also just fun to steal locked balls in a multiplayer game.