Right. And of course you realize that going through a manual "close" routine every time you use the phone app isn't as convenient as having it automatically return to the contact list. I don't consider this a major issue, but I am always looking for tweaks to simplify my usage. If I can avoid a tap or 2 every time I make a call (before or after the call) then I'm happy.
And you do realize you HAVE to go through a manual close routine anytime you use ANY app on the iPhone...
After a call, it does default back to the Contacts then I just hit Home. And again, you will always have to use the Home button to get back to the Home screen regardless of if you are in the Phone app, Contacts App, Google app or Safari app, so that step is unavoidable. So again, not sure what is so difficult or what more do you want.
Ok, let's add the Contact app to the iPhone and then we'll get even more people complaining "Why do I have contacts in both my Phone app and Contact app, this is unnecessary, it was all much cleaner with everything in one place, blah, blah, blah, blah" and then guess what, you will STILL have to use the Home button to exit out of the Contacts app!
I give up on you lazy, whining I-want-everything-so-simple-that-I-don't-have-to-lift-a-finger type people!