Realistically, is that a feature you'd use more than once? Honestly, no. I think this will be a feature that most people, me included, will play around with once and immediately forget. After all, once you've set it to your liking, there's little logical reason to ever tinker with this slider ever again. But on the other hand, it clearly shows that Apple has heeded users' feedback on Liquid Glass, which is a great thing to see.