This doesn't necessarily mean that product Y is better suited for you in particular it may just mean people might have been artificially funneled into purchasin

This doesn't necessarily mean that product Y is better suited for you in particular it may just mean people might have been artificially funneled into purchasing it either through wide advertising reach or through models such as this. It's certainly useful in some regards but it's not a catch-all and a lot of that is simply because of wide reach advertising, better marketing, and in the case of Amazon many products may just have artificial reviews. You still have to consider the alternative that what you are being recommended, even the "Customers who looked at" doesn't automatically mean there isn't bias or artificial incentives that push people in one direction over another. There's a reason Thaler won the nobel prize in economics for his work on "nudge" theory.