GSMA , the "relevant industry body" first proposed RCS in place of SMS in 2016 after a lengthy "review" process. Last time I checked it isn't 2027 so your "over 10 years" argument is ridiculous. As for the standard argument, it simply doesn't matter what you or I think, the GSMA body set the industry standard and they want RCS.
You're also wrong about it being a "mess", and "failing". This is just more of the exaggerated nonsense that your arguments rely so heavily on. E2E for group chats is still to be tested and implemented but for individuals all the benefits of RCS already work, and flawlessly in my experience. For all we know that last missing feature will be ready next year when Verizon adopts the RCS protocol. RCS also isn't seeing the security problems that iMessage has experienced. No text is shutting down my phone.
That Google bypassed carriers and began to roll RCS out two years ago is a good thing and that makes it no different than iMessages, WhatsApp, Telegram etc who also bypass the carriers. None of them are the "garbage dump" that you describe. Besides my own experience using RCS, that fans of iMessage feel the need to form dishonest and nonsensical arguments is just more proof of how great RCS is imo.
Like it or not, the only reason that Apple won't follow Verizon next year and support RCS is because Apple's commitment to security and privacy has always been more about marketing than substance. Ignoring the far more secure and feature rich RCS and the benefits it brings to their own users will be yet another example of that.