LOL. Literally nobody cares about RCS except Google. Apple has Messages,
Meta Facebook has their chat apps, WhatsApp and Messenger. Users who don't want to particpate in their data hoovering machine have the option of Signal, Telegram, and others. Asian users rely on LINE, WeChat, etc. There is no shortage of cross-platform messaging methods, with modern features, security, and at no upfront cost.
The carriers came up with RCS in
2008, to replace SMS, but allowed it to languish for at least a decade, and even they don't really care about it.
Google, having killed one messaging effort after another, adopted RCS as the basis for their "one, true, final, really, this is it" messaging service in 2019, their
ninth attempt. The carriers then pretended to care, and started CCMI to promote it, but killed that effort in 2021 after realizing the harsh truth that they lost they messaging war a long time ago, and since there was no money to be made, there was no point. The days of fleecing users per text message were long gone.
E2E was never integral, or even a requirement for RCS, and Google only added it, to their own app, for 1:1 chats in 2021. Encrypted group chats didn't become a thing until the end of last year.
And because it's a carrier standard, it relies on the paradigm of user IDs centered on phone numbers, singular devices (your phone), when people have moved onto other portable forms of ID that don't have the albatross of carrier strings, as well as multiple devices long ago.
Nothing wrong with a NOS Crown Vic, customized with all mod cons, and an EV powertrain retrofit, but it's not going to appeal to the broader audience.
Google's PR campaign reeks of desperation, and the only people it might convince has merit are technophobe regulators who might try to force it as some sort of standard. But the market (users) spoke, everyone else moved on long ago, so there is nothing to "fix."
It's become more evident than ever that Google is a three-trick pony -- Search, Maps, and Gmail, that feed its real business, advertising. And wtih one of those pillars being seriously threatened by the new AI-based tools, it rushed out Bard, in a less than flattering manner. Otherwise, their wall is mostly white, and very slick, with the adjacent floor
space littered with carcasses.
Having a dominant position is a good thing, but it's also an easy path to lost focus, and complacency. Ask Intel.