At least Whatsapp itself shows ad banners that you can now connect other messaging clients into Whatsapp, so it should be normal that other clients can equally access Whatsapp.
In any case, official interoperability is only for third-party messengers communicating with WhatsApp users, not for automation or bots, as I understand, so it's not a replacement for things like this project.
It seems Meta is able to set some rules about the interoperability making it very difficult for an FOSS implementation to emerge. Additionally organizations like Signal though technically interested in this interoperability have stated they won't lower their security standards for this.
How far back does the backfill actually go? Does it pull your full history from the primary device or is there some limit?
Who are these people using the cli?
Obviously it helps that one can pipe as it might see fit in the flow of an ad hoc filled need, and so leverage on mastered composable tools.
That will never be for everyone, but it will be for no one only the day it becomes logistically unsustainable to reach some endpoint though a CLI.
- automation - sometimes avoid enshittified, privacy-invading services - fast, responsive, keyboard-friendly, debloated but non-minimized, stabler interface
What could possibly go wrong with that.