Regarding RCS. If they are going to add RCS support, it will be through Google’s API with Signal protocol for encryption (as I understand it). But Google hasn’t published it yet. That’s why RCS is not implemented. The Signal developers, looking from the user side, weren’t thrilled with the idea either. For example Greyson, one of the Android app developers, used it for 6 years for SMS. But I think we need more of a good messenger with support for a lot of features more than we need SMS support…