Atm this is a bitcoin-only tech... as the others aren't implemented yet. Isn't Bisq enabling BSQ token trades too? for this reason should be not bitcoin-only?

Isn't Robosat allowing Monero payments too? for this reason then is not bitcoin-only?

Aren't both enabling fiat payments too?

Tell me what do you mean by bitcoin-only, and then we talk ;) because somehow, you'll be always be exchanging it for something else, whatever it would be!