Ifixit actually has a pretty stellar site for most common phones - at least, every phone I’ve owned so far.

https://www.ifixit.com/Guide

I’m realizing now that they’ve actually got way more content than I thought. It isn’t review format, but they rate how difficult different components are to repair on most items which is a step towards what I want.

Weird that I thought they only did phones/tablets/computers.