There are many reasons that I do no like the Apple iOS developer experience.

Random e.g.
https://forums.coronalabs.com/topic/33811-your-application-does-not-have-a-valid-signature/

And - oh my fucking god - e.g.
 http://stackoverflow.com/questions/21328258/the-application-does-not-have-a-valid-signature-shows-every-second-time-in-xco