I agree - although stereo is certainly not immune to the "more is better" marketing nonsense. Just look at many of the thin tall consumer speakers that try to break the rules of physics by adding a dozen 3" drivers (without using a real transmission line design) and claiming to be "better" than a good 2 or 3-way speaker. But, as long as there is a "subwoofer" booming away at 50 Hz in the corner, the consumer thinks they are "hi-fi"... (especially if it says Bose on the box!)
Well desktop speakers marketed to consumers have always been junk. The single, rare exception were the Advents from 15 years or so ago. You could buy those in computer shops and they sounded pretty good, all things considered. They were also fairly large. You can bend the laws of physics, but you can't break them. If you're unwilling to have a speaker on your desktop that's more than 4" thick, you're not going to get very good sound.