You end up duplicating the logic achieve to offline-first, and reduce network roundtrips. Eg your sign up page final validation is probably the server's job, bu

You end up duplicating the logic achieve to offline-first, and reduce network roundtrips. Eg your sign up page final validation is probably the server's job, but if you want to give earlier/faster failure messages, you'll want it on the frontend too. Server authoratative validation is security; frontend validation is UX