How much information do you have for buying one computer versus another?
Quite a bit actually. My latest computer purchase was a mac mini to use as a music server, which I compared to many other options like CAPS servers and other small non-laptop machines. At OWC online you can watch a video of them taking apart an entire mac mini to install new memory, drives, etc. I ended up having Mojo remove the SMPS and install filters plus an outboard linear power supply that I reviewed a picture of on-line before choosing Mojo to do the work.
Yes you get amount of memory, processor speed, size, weight, etc. Do you seek interior pictures or timing of various tasks before buying?
Actually, yes again, except maybe for inexpensive laptops or machines from "known" suppliers but even then the components they use are almost always listed so you can look them up.
There are ways to hide proprietary circuits from a casual photograph but IME the absence of transparency often hides BS, especially when it is accompanied by overly enthusiastic rhetoric. Maybe I have engineer's disease but I want to know how and why things work.