But the apps you buy on the phone you use on the phone... If I buy/rent a movie from my iPhone I can download it on my mac and on my iPad and on my PC... I can even stream it to my HDTV with AirPlay...
the point was that you don't necessarily use the thing you purchase on the device you purchase it with. ie, you rent a movie on your iphone/ipad watch it on apple tv (I assume this is possible). My point was I thought it was more likely that you will watch something you rent on the device on which you actually rent the item in question. The issue was brought up that you can't see ipad only apps on your iphone.
Your statement holds true for ipad apps as well, if I buy it with my iphone I can see it on my ipad. So why can't I see iPad apps on my iPhone?
(I concede that it got way more confusing based on the way I presented the argument without linking to all the quotes.)