For younger people who want easy choices I have 100% seen this lead people to default to Casper. I send around the article on their practices regularly due to this, and buy my mattresses off Wayfair mostly based on price and basic sanity checking.
Right now I have an incredible 14 inches of Queen memory foam I got for $400 that's incredible to sleep on. The brand? A no name.
What I've taken away from the mattress craziness is that if you exclude the fancy things like temperature adjustment and sleep number stuff, most basic mattresses come down to basic material and then secondly firmness. As long as you get those two things right they kinda all seem to be the same.