I don't think of it as a design flaw. Think of downloading an app you never had before where would you get the app menus, the warnings and so forth from?
Some apps, though, you can download in either Multilingual, english, and even some in such a small language as danish-only.
Firefox, for instance, can be downloaded with just a single language, Omniweb can either be downloaded as a "multilingual" og english-only version.
I don't use automated apps to do this as they scare me people run into trouble often it seems. I'd rather use the inbuilt feature to do it manually. First time is a pain, but after that, I simply do it on the specific app whenever it has been updated.