As far as I can tell, Dell has just a handful of models (XPS, Precision etc.), but if you go and look at the XPS 15, for example, it's a grid of dozens of SKUs with various specs instead of just a single page with customization options. It's not even a matrix -- with models varying by CPU and RAM and disk and such, you'd expect that at least they'd arrange them visually in some kind of table. It must be a nightmare for non-technical people.
They're all like this, and it becomes hilariously complicated when the manufacturer has, like Lenovo, dozens and dozens of models, and it's impossible to understand what the difference is between them and which ones are targeting which uses. (You have to ask why they're so unfocused, too. Is it an intentional tactic?)
Asus seems to be one of the few to understand this (aside from Apple); their Zenbook site is pretty friendly and focused. Though they still insist on nonsense model names like "UX390UA".
It's not just PCs, of course. It's all consumer electronics: TVs, sound systems, what have you.