1. If you work in a niche area, I can believe this. However, 99% of the mainstream apps and games are in the Google Play store.
2. IOS ecosystem is better than anything out right now. Makes a difference when a single company makes hardware, software and sells it direct.
3. ???
4. IPad screen is better than the new Nexus tablet. More ppi. Was this ever debatable? It was a way to keep the thing under $200 is my guess. Some people may not need a 'retina' display and still be happy with their purchase.
5. You do know that Android devices can sync perfectly with iTunes, right? Additionally, Google apps like calendar, gmail and drive can auto sync with any mobile device, except maybe Blackberry.
6. A 7" Nexus will be more than twice the size of a 4" iPhone. Just like a 10" tablet is nearly twice the size of a 7" tablet. Big difference. Although, I agree with you, if you already have a 4" or larger phone, plus a 10" ipad, there is no need for a 7", but it will beavailableif people want it.
7. You can't think of any reason to get something like the S3 over an iPhone? That's because you are accustomed to NOT having features with Apple.