Proof for this is to go to yabu.me and despite not knowing a word of Japanese, still being able to post and interact because you already know - as memory reflex - how nostr conventions works (nip-07, lists of relays, the + button, etc.)

Nostr in this sense is alike transit etiquette (following transit sings in other country), or if you like, like driving standard (whereas x is the puny automatic or self driving 😆 )