Earlier quoted context omitted.
Corollary: Web page creators are no longer interested in answering your query; they're interested in getting you to 1) view their page for ads 2) click on their affiliate links 3) buy the product they're selling. Google has an impossible task in trying to answer a query like "Portable air mattress reviews", because 99.99999% of the results are SEO-optimized crap
We don't know if the task is impossible because Google has no incentive to do it at all, so we can't assume they are really doing their best. They created this situation and they profit from it just the way it is.
On the other hand, they have an incentive - increased competition, they can still monetize better pages, search is what makes them money.