If reviews are just a hobby and not a way to make money, eventually you will slow down or move on, opening a hole that gets filled up by spammers.
In my experience, the best reviewers are hobbyists. The thing is, it's not reviews that are their hobby. Rather, they review the products go along with their hobby.
So, for my hobbies (espresso and aquariums), there are tons of easily accessible reviews on all kinds of aquarium gear and coffee machines, grinders, etc. On the other hand, nobody does plumbing or HVAC as a hobby (that I know of) so it's very difficult to find high quality reviews of water softeners or furnaces. It takes a very special rare sort of person who would install these things just to review them. The closest thing I could find was this video [1] on a DIY water filtration system by an RV/off the grid type hobbyist (from what I can tell).
People like to talk about their work too. There's plenty of those sort of reviews out there. Mostly on reddit because like others have mentioned organic search results are completely gamed.
In my experience, the best reviewers are hobbyists. The thing is, it's not reviews that are their hobby. Rather, they review the products go along with their hobby.
So, for my hobbies (espresso and aquariums), there are tons of easily accessible reviews on all kinds of aquarium gear and coffee machines, grinders, etc. On the other hand, nobody does plumbing or HVAC as a hobby (that I know of) so it's very difficult to find high quality reviews of water softeners or furnaces. It takes a very special rare sort of person who would install these things just to review them. The closest thing I could find was this video [1] on a DIY water filtration system by an RV/off the grid type hobbyist (from what I can tell).
[1] https://www.youtube.com/watch?v=WCC4TOYYGF8