Probably a good batch of spaghetti code if you think vanilla can be used for anything serious.
Or rewrite react yourself as another commenter already did.
Or rewrite react yourself as another commenter already did.
Depending on the scope of the work, this is not allways a bad thing. I like my own framework. It does exactly what I want and I can tweak it to my needs anytime.
But I work alone and don't have to share my code with different developers, otherwise there would be problems ...