I know a few good bitcoin devs who haven't looked into nostr yet, just because , they haven't had the time and "social media" is not really important to them, we haven't really sold ourselves as a "generic communications protocol" yet, so nobody knows, and even if they do there's always some token that keeps promising "the new internet". There are a lot of good folks still out there, not all of them use Twitter, hence the need for nostr isn't as immediate for them.