I am sorry if this is what you feel about my comments. I never wanted to say that you should stop trying if you cannot get it perfectly right. I agree that trying (and perhaps failing or winning) is the motor to development and evolution. What I wanted to say was "Until we can't get it perfectly right, let's not make it a default." Do you think this a stupid approach from a QE's perspective?

You have said a couple of times, that users should not switch off modular repos, because they could break their system. What if, until we know it's perfectly safe, users would not break their system with modular repos off? In that case, we could have a modularity opt-in for the time's being, and we could buy us time to test default streams and whatever you need to test.