Kagi should heavily boost a curated list of known, high quality review sites. For example, I have the following sites boosted or pinned: wirecutter, consumer reports, gearlab, and house fresh.
Many reviews are now falsely claiming to perform testing in order to artificially boost their rankings. I think it would be difficult to automatically determine whether a review site actually performs non paid, independent, data driven testing and reviews, especially since this is pretty rare.
But a manual audit by the Kagi team could determine this, and then that site could receive a significant boost, commensurate with the high value of such sites for searches like "best air purifier on a budget" or whatnot.
Any product search should massively boost tier-1 review sites. Searches like "best headphones", "best performing humidifier", "hiking shoe reviews", etc. Many typically high ranking websites like Forbes or CNet no longer publish high quality reviews and sometimes publish AI generated botshit, skating by on past reputation.