Between certain models, the Dell Inspiron and the Dell Latitude had interchangeable motherboards, had the same integrated graphics, and sourced the same LCD panel. But the actual 'same-ness' is irrelevant in this case - the real issue is my impression that I'm going to get 'ripped off' if I don't sit down for hours and compare their entire product lineup every time I want to buy another Dell laptop.

That's a terrible customer expectation and experience vs. Hey, I want an Apple laptop. Oh, I want the Macbook. Look, it's $999 + some basic options. Done.