i find it telling that the stated purpose of the company behind the briefs product is: "to give [our] users the best experience possible."
the thing is, the "user" to briefs is someone with an application idea drawn on napkins who wants to release a prototype application "without expensive development". to apple the user is the REAL user... the user of the application created by the user of briefs prototyping tool, and to apple, that user is not getting the best experience possible... they are getting a translation.
imagine you are a company that could benefit by making a high profile apple product look slow and buggy and prone to crashing... you release an innocent enough looking "prototyping" tool... it doesn't make applications as optimized as one's with "expensive development", or using the free native development environment, but it's dumbed down and simpler, and hey, it's just a prototype and it works... the translation isn't optimized at all, but all the buttons will do what you tell them to do... now these prototypes are going to be seen by people and the hardware will be judged by the responsiveness of the software.
apple has taken a firm and understandable stance: THIS IS HOW YOU MAKE SOFTWARE FOR THIS DEVICE. NO EXCEPTIONS. *cough* except javascript.