the way to answer questions in Judaism is to actually test changes in practice

Interesting point. See the joke about the two lost Jews and the three synagogues. I would say that Judaism is something of a continual experiment, but experimentation necessarily requires the notion that some experiments will fail, right?

You can't "question" forever

Would Socrates agree with that? I also think it's not unique to Judaism to have mystery, unknowability, and ineffable nature at the core of things.