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Google is silently blocking RCS messages on rooted Android phones and custom ROMs
(www.androidauthority.com)
This is a most excellent place for technology news and articles.
Having built Android from source for several different devices, I'm accustomed to dealing with blobs and configs that enable access to each device's hardware, including the modem. Custom ROMs generally just install the OEM drivers that came with the device, and let Android use them. That normally doesn't involve reverse engineering.
I suppose it's possible that RCS might depend on special modem features that somehow can't be used like all the other hardware in the system, rather than just sending/receiving data over the network. (As I said, I don't know much about RCS.) But it would be an unusual case. That's why I'm a little skeptical. Since you haven't given any references or supporting details, I can't tell whether you have domain knowledge that supports your claim, or are just making assumptions.
Shrug... I guess it doesn't matter, though, since time will tell. Cheers. :)
My background: have build some already done ROMs and spoke with some Linux mobile people about it :). Just to let you know, I also need some source to prove it, but having so little info how RCS works in floating in public non-specialized space is also telling something.