It would be so hard to maintain repair guides with how frequently products update these days. Everything from vacuums to laptops to shoes go through frequent enough revisions that guides might be invalidated often.
I went to repair my vacuum last month and discovered most of the guides out there cover an revision which uses a totally different latching mechanism for the door to my intake filter. The doors look identical, but the internal latch works differently. Overall that would have been fine, but I got blocked on the door part because the procedure didn't work and I assumed I was going to break it if I tried something else, haha. Turned out I just needed to push in and slide down.
I’m realizing now that they’ve actually got way more content than I thought. It isn’t review format, but they rate how difficult different components are to repair on most items which is a step towards what I want.
Weird that I thought they only did phones/tablets/computers.
What's needed is to turn it all upside down: rather than reviewing new products, review broken products.
Make a site about how things break -- review broken and worn-out products to teach how to identify cheap products (where are the stress points, what manufacturing techniques exist to alleviate those). Then compare those with used products well past their warranty period that haven't broken, and look at why they haven't.
Repairability also comes to mind. Everything breaks eventually -- can't cheat entropy -- but when it does, can you easily repair it? Right-to-repair movement would get in on the action.