Even if you do, they're still not necessarily exclusive: ifixit tore down a bunch of HP devices, and even the "Elite X2 G4" two-in-one — not exactly a beastly looking device https://www.notebookcheck.net/HP-Elite-x2-G4-detachable-will... — got 9/10 on repairability: https://www.ifixit.com/News/hp-makes-the-modern-repairable-d...
So where is the thinner obsession coming from? Why are they removing all the ports?
Isn't it because of fashion?
Functionality and esthetics do not have to be mutually exclusive, but the people designing laptops don't seem to be aware of that.
It could also be because they just try to sell whatever it is they think most of their customers believe they want / need (wether or not said customers are right is a whole other matter)
A thick laptop with many ports can look just as good as a thin one.