> Why couldn’t they run it on their iPhone if the app is for themselves? You can install it directly from xcode, the problem is when you want to release it to others.

Assuming you're referring to free, non-developer accounts, having to re-sign one's app is a really annoying inconvenience which should not exist.

I grow really tired of these excuses for the multi-trillion dollar company doing its best to make it difficult for users. "Just do this really annoying thing. What's the problem?"