nostr:npub1zuuajd7u3sx8xu92yav9jwxpr839cs0kc3q6t56vd5u9q033xmhsk6c2uc suggetsed this matrix when I first started nostrability. 

Currently nostrability focuses on the inverse - out of supported features, which ones are broken. 

If memory serves me nostr:npub1l2vyh47mk2p0qlsku7hg0vn29faehy9hy34ygaclpn66ukqp3afqutajft had a suggestion a few months back on something akin to devs self-attesting to a feature in their app