I disagree, depending on the animation. There was this BMW SUV (I'm not really sure which model) driving around here and their turn signal looked nearly indistinguishable from a sunlight reflection. It faded both IN and out, with a slow transition across, and I personally barely could tell it was on unless I was staring directly at it. It doesn't catch your eye like a turn signal should.

I think animated signals are fine, but there should be some rules to it, like requiring it to flash on, but allowing fade outs or transitions.