The reason it hasn't happened yet is because that's a full time job, the initial costs are high for AV, the profit margins are razor-thin. (or, at the least, the money a person with the skills to write quality tech journalism would always be far less than the money they could earn by applying the tech skills for technical tasks)
Aren't you just describing VentureBeat and TechCrunch, etc?
I would contribute to this, both in terms of donating to see this happen but also to the content and/or the community. Silly as it sounds, my least favorite thing about HN is the startup content---i don't care about agile this or lean that or pivoting or whatever, I'm interested in people "hacking" on passion projects, making cool tools, and breaking stuff.
An actual tech news column with reporters and a sleek website and or maybe a podcast here and there
I mean seriously why hasn't that happened yet