Q: Question for those experts on apple equipments: I got the appletv 4g but I am under some frustration because it does not allow me to get all the apps I have in my iphone or even my ipad. Is there some explanation about that ? Thank you for any help.

iPad and iPhone Apps are not directly compatible with the Apple Tv.  There may be some apps that have versions specifically for the Apple Tv, but many still don't.

If the App is not in the Apple Tv App Store app, then its not yet compatible with Apple Tv and cannot be installed on the Apple Tv.

Apps that rely heavily on keyboard or precise touch input are unlikely to be suitable for direct conversion to Apple TV. It is up to the developer of each app to decide it they wish to try to make the changes that are necessary to make it compatible with Apple TV or not.

tt2

Not sure I understand the question.

TvOs is a different platform with different requirements to that of an iPhone or iPad.  Not sure why you would expect they would simply work directly.