PC makers can't count on brand loyalty. If you want a PC and your favorite brand is missing something that a competitor has, it's easy to switch. If you want a Mac and Apple is missing something, it's harder to switch. Enterprise sales are a bit stickier, but not that much stickier.
So Dell, Lenovo, et Al end up trying to address every niche except the focused product catalog niche.
Like Dell Vostro, their "small business" line. Versus Latitude, their "business" line. What on earth is uniquely needed by a "small business" versus a... regular business? Why not introduce a third "large business" line? Maybe a "sole proprietor" line too?
It can only be explained as a psychology play. The dizzying array of options is designed to, I suppose, make you feel like Dell surely has the exact right laptop for you, even if that is bullshit.
It doesn't entirely make sense to me from a psyche standpoint either -- I have no idea why purchasers would possibly feel anything other than anxiety and analysis paralysis. But whatever!