Is Memory Tagging Extension (MTE) and/or Memory Integrity Encforcement (MIE) one of the requisite features for GrapheneOS?

The recent moves from Google that look like Android will become more of a “closed garden”, and it might affect the furure of privacy ROMs.

I’m not sure if thats the same reason for this, but GrapheneOS have stated that they are working on a phone from another Android OEM. I have no idea if apple’s chips allow exclusively ios or linux-like os on the system, but how feasable is it that they might consider Apple (given if the inclusion of MIE & MTE makes iPhones more compatible with gOS) in the future?