Wow, this is an amazing idea.
Questions (as posts) and Answers (as comments) would both be able to receive votes, generating steem for those providing worthwhile content. It would reward everyone involved, and with steem power, those that provide great content would have their opinion weighted more just by how steem works.
Going even further - an enterprising developer could build a website based based on this idea and the steem blockchain. It would be designed to only display posts with specific tags, maybe tags like you mentioned above, matching /-help$/. That new website could be used as the interface for asking (posting to the blockchain) and answering (commenting on the posts) and automatically tagging posts in the proper categories.
Imagine you login to this website and click "ask question". It gives you a dropdown, prefilled with programming languages and technologies. Each one of these entries displays a human readable name of a technology, and behind it, it's value is something like mysql-help or docker-help. The user picks the dropdown that says "Docker", then fills in a summary of the question (title) and the full question with examples (body). They hit submit and it submits the question to the steem blockchain.
Having content in a blockchain blows my mind. I've been building content systems for the past decade or so, and never have I seen anything quite like steem. It's incredible.
You've got my upvote.
Still feels like a "hacky" solution. Good for now, but in the future I like to see a steem API used on stackoverflow itself and on many more other sites! There simply can't be a "one that fits all" type of steemit platform.