RCS is an open standard created by telecom companies as the evolution of SMS/MMS.
There are significant drawbacks as end-to-end encryption is not part of the RCS standard.
iMessage, WhatsApp, Signal, etc. are secure messaging platforms that superseded SMS/MMS messaging because of better media support, unlimited messaging, and messaging across devices.
If privacy and security are major concerns, RCS is a non-viable solution in its current form, with or without google’s non-standard extensions (which add end-to-end encryption between Google RCS users only).
As much as Apple may be gaining advantage from staying proprietary, they are currently one of the only viable privacy focused communications technology vendors consumers can choose.
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