All up, though, I wouldn’t worry too much about this decision. The far more important part is that you’ll be able to write Gutenblocks using whatever framework you prefer, and this focus on interoperability will drive WordPress’ JavaScript development for many years to come.
Yay for having 2 versions of react, a bit of jQuery, 2 versions of Vue enqued by 5 plugins resulting in 10 requests, some other libraries loaded on the Post edit screen. This is not a good thing. You saying that this is good to me just sounds like you can't defend the decision to go with React given the support for Vue so you try to supplicate critics by not taking a stand. This is even worse than going with pure React.