Our entire ecosystem that we have built (for better or for worse) by using these libraries as the foundations for countless projects necessitates that when a community is willing to give their time to improve a library that you maintain, the minimum that is to be expected is that you treat sincere contributions respectfully and not dismiss them out of hand.
It's unfortunate that the maintainer has stepped down entirely instead of changing how they are interacting with the community, but purely from a security standpoint I would rather a slower (but more secure and receptive) library take it's place than have a very popular library maintained by someone who doesn't seem to care about the overall code quality of the library they are a steward of.