Thats great stuff, very informative, and indeed for apps to work directly with the blockchain can be tedious.
The only worry, is that the HAF might be a single point of failure, as its not distributed as the blockchain is.
But usually each app create kind of a HAF for itself so it make sense to cooperate and avoid duplication.

Thank you so much for sharing and engaging, after all thats what Hive is all about.
I can't wait for the day that instead of stackoverflow I will enter Hive.blog (or other Hive app) to get my answer and reward the author.