Other than RCS is tied to the 3/4/5G carrier networks and cant work over other media or physical protocols. It's more of the same bullshit layers on top of GSM

Other than RCS is tied to the 3/4/5G carrier networks and cant work over other media or physical protocols. It's more of the same bullshit layers on top of GSM instead of messaging being independent of the device. iMessage is tied to your Apple ID, not your phone number or IMEI.