I don’t know for sure but my guess is that a lot of US users thought you were wrong because they don’t know that SMS / MMS is essentially dead in the EU. It’s still the primary text based communication method in the US.
MMS supports all the things you mentioned (albeit in a shittier way) except encryption. RCS adds a new layer that is more like Signal in that it supports encryption and emojis and a few other things but it is controlled by Google and there are no open source alternatives currently.
I don’t know for sure but my guess is that a lot of US users thought you were wrong because they don’t know that SMS / MMS is essentially dead in the EU. It’s still the primary text based communication method in the US.
MMS supports all the things you mentioned (albeit in a shittier way) except encryption. RCS adds a new layer that is more like Signal in that it supports encryption and emojis and a few other things but it is controlled by Google and there are no open source alternatives currently.