I honestly believe that Godot will overtake Unity one day. Unity has a huge amount of momentum, but it kind of feels to me like the difference between JQuery and React right when React was a fledgling library. While Unity has a lot of entrenched developers that have been using it for years, my (unfounded) opinion is that new developers entering the gamedev scene will pick Godot over Unity more frequently, and that will bear out in the long run (years).

I know this is kind of unrelated to your point, though :) Additionally, I use Ableton all the time and I don't see any FOSS alternatives that hold a candle to it. Then again, I could be one of those entrenched devs just like those I said exist working with Unity!