Warning "Keeping target iOS version on "4.3" or above is highly advisable"

When I build project for iOS 4.0 warning appears:

Keeping target iOS version on “4.3” or above is highly advisable to minimize App Store submission troubles.

What it is about? Why there is such recommendation?

guitarxe is right. 4.0 is a ridiculously old version for iOS, a version thats the App Store struggles to support anymore, thats why you’re getting that warning because so many things are so obsolete for support.

Hence why you might run into submission troubles.

Does anyone even use 4.0 anymore? And if they do, I doubt they are interested in the AppStore anyway.