RCS is awful. It’s an out-of-date, encumbered “standard” with poor global commonality in adoption. It exists for one reason only - because US carriers wanted some way to keep charging per message like their old sms cash cow, instead of being reduced to just proving dumb internet piping. Despite that, the carriers couldnt even agree amongst themselves on the "standard" RCS features to deploy for 10 years or so, until google co-opted the effort for their own goals semi-recently. Let it die.