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Evan does do a lot of the maintaining with Vue core (https://github.com/vuejs/vue), most of the other packages have a higher amount of contributions from the core team. However, i know it's on all the core teams agenda to become more involved in the core.
I would like to note that there is more and more contributions done by the public, which is awesome. There is also many large changes being made in the core such as improved TS support, that are not produced by Evan.
I would like to point out that we are using the 'Squash and Merge' feature on GitHub when merging PRs, so the commit count isn't very representative of the community contributions.
Definitely! For example, the multiple conditional root nodes on a template mentioned in another answer was one of my contributions. 🙂
Many big features also go through a lot of discussion on GitHub or internally before they're implemented, regardless of who writes the final code.