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What? Even my old mom uses RCS with zero problems. It is a solved problem and Apple is dragging their feet exactly because of this.

Does your old mom use RCS in large group chats?

Size isn't the issue, but she does use it yes. With friends scattered throughout Europe.

Size is an issue, because with more people in a chat, there's an exponentially higher chance that someone doesn't have RCS or has some issue with it.