I disagree with this somewhat. Apple and Google make these sweeping decisions for their users and in effect promote one tech over another. Adopting RCS and integrating it natively, but shunning open protocols and leaving them for third party apps (with probably worse OS integration) means you are following, not leading.
I would at least consider shifting approaches somewhere down the line. Yes, there are a plethora of open messaging protocols out there, but adopting one for first party integration doesn't prevent the others from being used.
RCS is what GMS Android and iOS provide so that's what people need to talk to non-GrapheneOS users.
Which non-carrier-based messaging app or protocol do you think we should include and why? What happens if we decide that's no longer the best one wand want to get rid of it? Apps included in the OS cannot be easily removed but rather only disabled by default for new installs and phased out for new devices. Otherwise, users would have their working setup break.
And the OS should come with a GrapheneOS Monero wallet to compete with Google Wallet/Apple Pay.
This makes no sense especially when you’re comparing it against Apple Pay and Google Wallet. They shouldn’t waste resources on something so pointless. The only exception is if they can actually make an NFC capable app that can handle cards.
Obviously it isn't a direct substitute for Apple pay but it would be more functionality than we have now.