That's why I'll defend vigorously the way we use SMS in the US.
Sure, it's an outdated, insecure, bad system. Improvements like RCS are still iffy and poorly-rolled-out. But it's also a standard you can use to connect with EVERYONE, isn't controlled by a single private company (even if the evil fucks at Google desperately want it to be), and is totally interoperable between apps (since the apps are, after all, merely implementing a protocol).
I have high hopes the interoperability standards the EU is proposing will amount to something, but I won't be holding my breath for it. In the meantime, I am not going to switch to whatever app is trending until it can at LEAST do everything I currently can with SMS.