On the other hand, when it gets to the point where the technique interferes with understanding, yes, that is a problem.

It worked for me some of the time; I think it interfered more. It worked better for my mother. It totally wrecked the experience for at least one person I've heard from. I understand what Nolan wanted to do with it and why. I'm just not sure it was the most successful tradeoff with the technique possible.