If you want to see some really terrible design — truly abysmal — take a look at the new Google Chrome.
The tabs are now completely invisible. Just utterly indiscernible and the UI is a gray blob of a mess. Do designers not realize that contrast improves designs greatly, that being able to distinguish elements is very important? And this particularly harms those with poor eyesight.
Designers should not be allowed to design anything as their priorities and incentives differ from those of the users so much now in all cases.