That is exactly the kind of thing I mean. If the user removes a reaction and some relays keep serving the original event back then the interface can end up showing something completely different from what the user thinks they did. A new user will not know what kind 5 means or which relay ignored it. They will just see that they removed a like and somehow it came back. If Nostr is going to reach more people then this kind of behavior needs a real solution at the ecosystem level. Not an explanation every time it happens.