That's what I meant with overwhelming / too niche.
It seems like you intend to productize the RFC process e2e. But most "time consuming" parts of an RFC process is the human stuff "Did you read this?" "Did you update the RFC again?" etc. That back-and-forth seems to be expressed by all the features you have in RFC Hub but:
1. That makes RFC hub complicated.
2. Requires buy-in from every party to participate in all of RFC hubs feature like "Yes, I reviewed it and pressed the reviewed button in RFC Hub"
1 & 2 combined make RFC Hub (likely) a very niche product. New users are overwhelmed. Existing users need to onboard new users (their collegues) though. Otherwise, the RFC process will fallback to just DMs on Slack. Only a few teams will have sufficient buy in from all team members.