Apple will never listen, but maybe the EU could decide it's important enough issue for them to force it. It's starting to feel like we should just go to them, first. I'd like to imagine we have another candidate problem for regulation enforced fixing, with Mac laptops' long-standing displayport multistream problem. Macs will only mirror and never extend to an nth monitor over displayport splitting ... but the availability of thunderbolt adapters as a workaround takes some of the "oomph" out of that argument. That one's been around like ten or more years.
The other issue alluded to by another commenter, though, is that rcs is not low-level in Android os quite like SMS is. Like the API to get the information into other competing apps is not there, so it seems a little bit hypocritical.