1. they are not consumer cans though the classic is and may have the same issue but for the professional studio person comfort is a worthy sacrifice for over all durability, isolation, and of course sound quality. I am sure the build is excellent despite comfort issues.
2. A common huge misconception is that the pads need to fully surround the ear in order to make for better isolation. On the contrary the headphones I have seen and heard with great isolation are close to if not all the way on ear in design( hd25, dt1350,momentum,NAd,spider powerforces,hdj500, and many others) in the studio a lot if the over ears I have used don't isolate well and I have to turn the volume down to prevent it from bleeding into the mic and it is fun to record loud. There are exceptions to both where a full sized curcumaural isolates well and an on ear doesn't..... I say all of that to make the point that since these isolate extremely well the form and design may give you a clue of their priorities. Maybe they didn't want to loose something else by gaining more comfort