> RCS is a boondoggle that nobody supported
RCS is the official messaging spec of the GSMA, they effectively set mobile standards. It's on 90+ mobile operators in nearly every nation on the planet. It's just as widely supported as, say, Voice-over-LTE is (another standard by that same group)
SMS is the outdated standard that's been mostly unused on smartphones since 2018 and is only supported for backwards compatibility. RCS is the replacement for SMS, and is the current ubiquitous and broadly supported standard, since 2019 effectively all modern smartphones and cell network use it.
> Google decided to add support for it to Android in yet another attempt at building their own messaging platform.
No, that's a complete lie. Google added support for it, because they basically had to, it's an industry spec that practically every cellular provider uses. It has nothing to do with "Google's own messaging platform" because RCS is *not* a messaging platform, it's literally just how all messages on all phones work in 2022.
There's no Google service for RCS. There's no login for RCS, there's no accounts for RCS. RCS is not an "app" or a "platform", it's literally just the native default built-in way all messaging from your SIM card works on all ~2019+ smartphones.
> There is no rational reason to take offense that iPhones don't support RCS.
You know what, your right. And by your logic, there's no rational reason for iPhones to support Voice-over-LTE (that's a GSMA push), so maybe every iPhone should drop down to 2G everytime a phone call comes in (but not an iMessage Audio Call, of course). And by your logic, there's no reason for iPhones to support Carrier Roaming (that's another GSMA pushed thing), maybe Apple should ignore that one too.