Nope.

I use Amethyst Google version(for auto-translate) & use relays

yabu.me

nostr.wine

(nostr-relay.nokotaro.com should also work) & browse global. In my timezone, only Japanese users are active on Nostr 😅

Japanese nostr use Japanese-only relays, and since everyone joined them, so there is no need to mentions. similer to group chat.

For Japanese users, sending a reply feels a little formal. So even if a reply would make the context clearer, it is often posted as a simple post rather than a reply.

This is not a phenomenon unique to Nostr or Twitter, but can be seen in all text exchanges over the Internet, and it is a difficult feeling to explain a clear reason even to Japanese users.