Comment by m000

The "there's no RCS API" sounds more like an excuse or at least a pretty shallow take. There is none now. But chances are that there will be an RCS API in the near future.

E.g. EU countries are split between plain SMS and WhatsApp as the preferred messaging platform for automated interactions with services. Google not offering an RCS API would be like pushing everyone to use WhatsApp for automated interactions. Would Google risk that? Probably not.

By pulling the plug from SMS support now, Signal just makes it certain that they will lose user base, no matter what Google does.

And it is also kind of disrespectful to anyone who spent their personal time advocating the use of Signal to friends and family.