I think the Vue team are a really great example of how to maintain a widely adopted open source project whilst keeping almost the entire user base happy. Steady improvements with a focus on backwards compatibility, easy migration between versions and a lot of consulting with the community. The new composition API had a little backlash when it was proposed, but it seemed like the benefits were well communicated and the community came round. Personally I love all the changes in version 3 so far.
I'm hoping the new composition API will make adopting Vue an even easier choice for larger projects, I think the benefits are obvious. I admit I do have a slightly vested interest in increased adoption though.
Congrats to the Vue team on getting this to RC stage!