What makes you think regular people are any better at it? For one, that's such small sample. Youtubers gather info from far wider sources than just a singular experience. Second, how can you know their biases? If you follow a particular reviewer, you come to what they like and dislike, and hence can form a pretty good judgment. For some rando - not so much. Was he having a bad day? Got unlucky with his piece of tech? Is a fanboy of some particular company or gimmick or feature? Is wildly misinformed, hence impressed with this product? Is really rich/poor, etc, which warps his opinion on the value? And so on and on.
Third, what about time, investment and methodology? A regular person won't just have put the time to make his review repeatable, comprehensive, with needed disclosures etc.
And finally, you don't think they already astroturf regular person review campaigns? How many fake reviews on Amazon are there from supposed regular people?
I don't really get this poo-pooing on the professional. Regular person is way overrated.