What would be the tradeoff from a UX perspective? You loose the ability to know where to find the most recently created notes, but does that actually matter? You gonna miss out on most notes anyways, unless you are a 24/7 doom scroller 😁.
The other tradeoff coming to mind would be if you wanna read the replies on a note, you have to wait until the client went through all relays... Unless we find a way to somehow tell the client where to look for the replies of a specific note 🤔.
quotingWhy can't we just open one subscription to two or three relays of each followed person in order to build the default feed?
nevent1q…wcyn
If that was possible that would make implementing "outbox" even easier than implementing a client that just uses a static set of relays. Caching notes from is easy, it's easy to continue fetching from where your cache ends. Relay selection is easy, no need to build complex filters aggregating multiple requests and do fancy relay selection based on whom you're following matches whom. Everything is just one loop.
Nostr is easy again, developers are happy. Even the dumbest web developer can do censorship-resistant Nostr clients for everything.