[ericvsmith]

I wouldn't say adding dataclasses was "reactionary". One of the reasons for adding it was to use it in the stdlib itself, which is obviously something we couldn't do with attrs. And because dataclasses skipped ahead to just using type hints to define fields, it has less backward-comparability baggage than attrs has.

As I think I made clear in PEP 557, and every time I discuss this with anyone, dataclasses owes a lot to attrs. I think attrs made some great design decisions, in particular to metaclasses or base classes.