As early as September 28, 2023, SMS messages will no longer be available when you update your Messenger app.
Was anybody actually using this? I honestly forgot this was a supported feature. This is coming from someone who is still not happy about Signal dropping SMS support.
It was useful for getting family who aren't as interested in the privacy aspects to use it. Having it be their default SMS messaging app means them being more open to using it to message securely with me without having to worry about there being another messaging service to keep track of.
As an aside, it did used to encrypt regular text messages as well.
I think everybody knows that, Signal even warned you about it. Signal removing SMS doesn't make SMS disappear, though.
In my social circles everyone uses WhatsApp, some people use Telegram, one or two use Signal. Getting people to install Signal as a better SMS app was a great trojan horse to spread safe messenging to less techy people.
I know Signal struggled with the lack of an RCS API but it's still unfortunate that SMS got removed from it.