The longer I code the more I value stability. That is not to say that stuff like immutability doesn't impress me -- I certainly do prefer an immutable data type for things like dates, strings, vectors, etc.
But as long as the API doesn't completely suck, that stuff is worth less to me than stability. Updating libraries, especially in the world of JS, is always a fingers crossed moment hoping nothing will break. As long as there are no security flaws I am happier with no updates than with continual nice-to-have additions and changes to the API -- especially if those nice-to-haves come with opinionated deprecations to the "old and busted" way of doing things.
But as long as the API doesn't completely suck, that stuff is worth less to me than stability. Updating libraries, especially in the world of JS, is always a fingers crossed moment hoping nothing will break. As long as there are no security flaws I am happier with no updates than with continual nice-to-have additions and changes to the API -- especially if those nice-to-haves come with opinionated deprecations to the "old and busted" way of doing things.