Thanks for this @James! As an advisor in Optimism, I definitely see the value of RPGF as well as its current challenges. I definitely appreciate the conversation starter and would actually probably have a little bit more to add to this once I have completed the retro on the latest Optimism round.
I know Metagov is working on even broader aspects of funding mechanisms together with what Eduardo highlighted so a potential scope out based on some of their insights would be interesting to explore.
Collaborating cross PG realms is definitely beneficial and disseminating learnings to continuously iterate on better versions is always a good idea!