Google abdicated its responsibility to Android users
It was obvious people with smartphones wanted to talk to each other. Apple created iMessage, which is proprietary but checks the most important box - security. It is peer to peer encrypted so it is secure from snooping by either the carrier or the governments of the world.
Google spread themselves too thin with a bunch of alternatives, and let WhatsApp take over as the default Android chat app. It was also secure from snooping but its one shortcoming was that it wasn't built into the text messaging app, so Android users still had two apps to use to message.
Google's solution was to push a "better" SMS, which is fine except that it isn't end to end encrypted so it is still snoopable by carriers and governments. Since it will be built into their text messaging app, a lot of users will drop the superior WhatsApp to use this, and lose security as a result.
Nice job, Google! - spy agencies of the world