All we know is that we’ve made a lot of crazy predictions about the structure and behavior of black holes well before we measured them and so far they’ve aligne

All we know is that we’ve made a lot of crazy predictions about the structure and behavior of black holes well before we measured them and so far they’ve aligned remarkably close to the predictions. If there is a difference, it’s about the interior not how it shows up in our universe. And since we can never see inside the black hole, any alternative model would have to better explain some phenomena our existing models can’t or be even easier than relativity and explain the same things. We know string theory is hard to make consistent and it struggles to create falsifiable experiments. I would bet on relatively remaining a very very long time until we figure out how to unify quantum and relativity.