i guess that he did not want to know if he could port scribus to iOS, but if he could use it on it :-)
anyway, apart the fact that there is Qt for iOS (
http://doc.qt.io/qt-5/ios-support.html ... i did not read through it...), and the probable incompatibility of the GPL on iOS, and the likely unfriendliness of scribus on iOS... as indirectly suggested, i would not use scribus on an iPad...
i guess that we agree that normally this is something one would not want to do, but if he really puts much effort, at some time he will eventually succeed... and simplest way is to run it through VNC.
so, summarizing:
cons: everything,
pro: none.
and i'ts not even the scribus' fault...