I've played church rooms as drummer. There are tons of ways to tone down the drums without a shield. Technique is number one, heads with some type of control rings or moon jell and dryer cymbals. Even different sticks can help. I think that they are trying to control the perception of a problem rather than a problem.
The problem is getting the drummer to do any of that. Hasn't worked at my church, with any of our drummers. The cage was the only real option, and even then that doesn't help much.
The drummers have calmed down a bit, so the levels are manageable, but still not ideal. The cymbals especially can still get out of hand.