Yeah - a good defense will never rely on one method for defending P/Rs. Nate's "switch everything" was fucking terrible - the opposition knew that they could get LMA guarding their PG out on the 3-point line any time they wanted, and they did it pretty near every possession. But Stotts' "fight over everything" is just as bad because the opposition knows that Lillard can't fight over the screen AND stay in front of the ball, which means there's a huge opening to our always-unprotected rim.
Even when we're facing guys like Curry you've got to go under the screen on occasion so they don't know 100% of the time what they're going to get. Also, why is JJ Hickson the only big in the past decade who has been able to jump the pick and then recover to his own man? Generally that is the most effective way to guard the P/R, but he's the only guy we've had in recent memory who has actually been successful at it.