I tried to switch from iPhone to Pixel 10 Pro Fold with GrapheneOS, but I needed RCS to work. Unfortunately, even installing Google Messages and allowing it permissions wouldn't allow RCS to work for more than 36 hours before I had to go through the whole install and allow process again. I would be willing to cut off all Google services, even banking apps and whatnot, but I need RCS to work. I'm unfortunately an American and cannot reliably expect my friends and family to use an app other than iMessage to text, so I need RCS. Will Motorola provide some GrapheneOS compatible RCS client? If so, I am likely to switch.

Could force them to use Signal perhaps

Yeah, see that's the thing that I think people don't really understand about americans. They won't. I will be essentially excommunicated. I already mostly am because I don't use Facebook or Instagram. Cutting off decent messaging by leaving imessage without at least maintaining RCS would really cut me off.