Oh, he knows how to design one. It's the QA part that he doesn't understand yet. I can't remember the last time I've used such an inconsistent and buggy UI in an Apple product.
Yeah because he designed/QA'd/signed off on this all on his own. The thousands of iOS software engineers have nothing to do with the final product that's released. Craig Federighi doesn't have to sign off on anything (he just has to present it on stage).
I'm running 7.1 on my 5s and iPad Air with no issues other than Safari tabs constantly re-loading (which I also experienced on my 3rd gen iPad running iOS 6) and the odd Safari crash (which maybe happens once a week).
----------
Jonny Ive Mentions Titanium if you read the transcript carefully.
Well the Powerbook was made out of Titanium.