First, RCS is not a very modern or practical standard. It was created in 2008 by carriers (GSMA!!) for their SMS/MMS centric (at the time) platforms. So is it a good idea to adopt this more than a decade later? I don’t think so.
Second, it’s really not Apple’s fault that Google has failed to come up with a messaging solution. Google has released 13 separate messenger apps since 2011!
“Right now, Google runs three mainline messaging apps: Besides this Google Messages/RCS platform, there's also Google Chat, which is a more traditional over-the-top messaging service, and Google Voice, which is a Google-provided phone number with SMS. Google Hangouts is technically still around as the fourth messaging app, though that's shutting down in November. There are also siloed messaging apps built into Google Maps, Google Photos, Google Stadia, Google Pay, Google Assistant, and Google Phone, and none of them talk to each other.
Google's head of messaging also quit last month, so there's no telling what the future of Google messaging holds until someone takes the reins. I would suggest Google get its house in order before it starts throwing rocks at Apple.” https://arstechnica.com/gadgets/2022/08/new-google-site-begs...