> Cursory glance looks like for modules - 17 implemented - 17 partially implemented - 7 unimplemented

The question isn't just how many? but also which ones?. Anecdotally, I've been test driving bun for a large application with millions of existing customers. So far, the only issue I've had isn't with bun per se, it's with patch-package not yet supporting the lock file (bun.lockb).

Bun is without question faster than yarn by a wide margin. And I say this as someone who really loves yarn.