PacStandardTW on Nostr: Vitor Pamplona, is there a technical reason why the clients don't cache posts and ...

Vitor Pamplona (npub1gcx…nj5z), is there a technical reason why the clients don't cache posts and follows/followers on the device, then cross check the relays after login? Would make the app immediately fully usable rather than having to wait for it to catch-up. Granted some of the cached content will be phantoms after the relays are surveyed but probably not much. Thinking there must be a technical reason this is not how it's done?