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.
Build a better mouse trap etc, if the task was possible, DDG / Bing / Whoever could absolutely dominate the search market by providing a ”no crap results” option
They would only bother to try if they could monetize it, and the only model for that which won't create the same incentives is paid user subscriptions. The market for that may just be way to small for the big guys to consider.
The top two organic results for that precise query are pretty informative articles from Wirecutter and Good Housekeeping. Unless I'm misunderstanding and you are expecting something better than this: https://www.goodhousekeeping.com/home-products/a25473658/bes...
