At one time to make a niche site you would find a couple good keywords and build a whole website around a certain subject and then write information articles to fill the lack of content. But lately, I've seen a lot of review style websites that choose a broader niche and simply skip all the filler, choosing to only write "best of" lists and reviews. They can more freely promote products, make more money, and don't have to do as much work.
It seems like the future of affiliate marketing is a bunch of mini niche specific Wirecutter websites. Thoughts?