RCS is still a downgrade to whatever propietary protocol Apple is using. Last time I checked, Google Messages was the only publicly available app that implemented RCS 100% correctly. I don’t think RCS will be the future, RCS for me seems to be some elaborate attempt from Google to troll Apple epicly.
Honestly whenever it comes to messaging, Google seems to revert from a world-leading tech company to some schizophrenic crackhouse without any plans for the future. They have published at least 30 messaging apps that are all shitty in their own unique way.