We’ve already got nostr:npub1l2vyh47mk2p0qlsku7hg0vn29faehy9hy34ygaclpn66ukqp3afqutajft working on https://highlighter.com so if someone wanted to contribute to the development of a productivity app, they should definitely put their efforts towards an open source #Nostr native tool, rather than build something to improve a proprietary traditional platform.