This is a decent solution, but not at scale. A big reason to even have all previous discussion archived is searchability and information availability. If the question has been answered it shouldn't be hard to find it. Having to have a human do the work of explaining something every time someone on the internet wonders about it is infeasible.
How often is information like: "What is the best quality X for this price point" evergreen to the point it is even worth writing down?
And the entire point of the discussion is that astro-turfing has papered over everything useful on the internet in order to sell low-quality crap.
The fact it doesn't scale is exactly why I use this method. Nobody is paying people to sit in a discord chat and recommend fishing poles. I know the information I am getting is from an enthusiast, if not a professional.
Yeah, the astroturfing is a huge problem. The entire internet has become a way for people to ruthlessly compete for your attention, it's like pulling up to a used car lot every time you try to find information.
What is needed is a way to archive actual useful information for lookup later.