A thousand times this. We'll know the JavaScript UI toolkit has started to mature when we can pick up a new tool and not have to abandon all of the other tools we already learned and spend a year getting on our feet in a new "ecosystem".
Don't get me wrong, it was the good kind of struggle where you grow and push yourself. Like going to the gym.
It was the same as any other programming language, framework, or ecosystem. Exactly the same as my experience with Ruby on Rails when I first started doing web development.