In the same thread you mentioned yourself, there are a few opinions suggesting that API Tools is nice to quickly bootstrap a project, but might not be as nice to maintain a project in the long term. You might want to consider that aspect, before investing more time in it. It might still fit your use-case, but it might also not be the magical tool that solve everything perfectly.
I’ve had great success in moving away from API Tools to Mezzio (and GraphQL via graphql-php), but it does involve more work upfront.
I suppose, once again, everything is about the tradeoffs your are willing to make 