Attached, from the comments; I personally am reserving judgement until we see what systemic issues may exist in RCS due to a) its collective upbringing, & b) government pressure:
It took a massive hack of US carriers networks to finally make Apple realize that ALL text messages needed to be encrypted and that cross platform SMS/MMS vulnerability still means there’s an attack surface for bad actors to exploit.
https://gizmodo.com/apple-will-fully-encrypt-rcs-messages-between-androids-and-iphones-2000576303
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