It's not a major distraction, especially for BCH with its small ecosystem and community one of the things a wallet should do is encourage people to use it and engage with the community which is exactly what BChat does.
Existing NOSTR clients/community is pretty hardcore BTC only so good luck getting them to add BCH. And yes, getting Signal to support BCH would be huge but if you think getting them to add it is easier than developing BChat I think Selene/BChat devs would love to hear about it.