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Samsung joins Google in RCS shaming Apple
(www.theverge.com)
This is a most excellent place for technology news and articles.
Apple should support RCS as a cross-platform texting option. It is meant to be implemented by cellular providers, not device manufacturers, and meant to be a more capable replacement for existing texting. It is not under the control of any single software or cloud provider. Think of it as improving “the lowest common denominator”. I don’t see why I would choose to use it but I do want the option.
Generally I don't think you choose to use RCS or not, if your phone supports it then it just uses it.
You can turn it off if you want.
At least when you use Messages.