Good? RCS isn't universal. Am I gonna be sending and receiving Google, Verizon, TMobile, or Samsung messages? It's not universally encrypted either. No way am I turning it on.
Vendors are going to have to actually work on improving the standard (and Apple has committed to working within GSMA on an appropriate multi-vendor E2EE mechanism)
In the absence of interoperable standards through GSMA, there will likely still be quite a bit of broken behavior, e.g. when it's not a Google RCS Server and all Google clients.
They don't have to, as they haven't for over a decade. It will suck and I doubt anyone will use it unless they're forced to (for 2fa). This is too little too late, if not iMessage, they'd use Snapchat, Facebook messenger, or IG before switching over to texting.
There is zero benefit for apple to make it good and no commercial reason for these vendors to make it good for multi vendors.
The only texts I get are unwanted spam or some confirmation codes and no it is not worth it to use RCS with the amount of unsent messages it keeps having problems with, maybe for some "possible encryption". It is trash all the way around.
https://9to5mac.com/2023/11/16/apple-rcs-coming-to-iphone/