Um, no one does that. You're using exaggeration to paint people who like something you don't like in a bad light.
I wonder if you realize that most people have never, and will never, plug their notebook into a projector, and most people don't have to plug in an external hard drive indefinitely on the go (i.e., need both USB 3.0 and active power).
Those minority that do need those things can choose between a MacBook + a single, small adaptor, or a larger MacBook Air or MacBook Pro. And since you highlight size and weight of the adaptor, the the difference in overall size and weight between the MacBook with the adaptors (let's go crazy and include all three) is still less than a MacBook Air with no adaptors.
So even in the extreme case, the MacBook is ahead in size and weight. That doesn't mean it's the best Mac for everyone, and no on here is saying it is.
Yes, the MacBook was intentionally designed by a group of humans and not randomly assembled out of nowhere. Brilliant observation!
The fact here is quite simple: some people will find the MacBook their preferred Mac, and some won't. None of the ones who do are saying that it's perfect for everyone, but it seems to be that the ones who don't find it to be their preferred Mac are going to great lengths to treat it as though it's not good for anyone, except, apparently, hypocrites and extremists.