I don't think I agree with your last sentence, which seems to be the issue. The site isn't called "The Terrible Design Decisions of iOS7", it called "Sloppy UI" which I think covers both bugs and UI. Further, sometimes it can be hard to differentiate between a bug and a design decision, so I think it's hard to ask them to just stick to one or the other. May as well point out everything you see that isn't up to standards, be those design or implementation.