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Without knowing anything about the app it's very hard for us to judge what the problem is.
They appear to be saying that the app's function doesn't merit it having the permission to act as the default SMS handler. If this is supposed to be a message app (as the thread title suggests) that would imply that either they are insane or that there is something essential missing from the app. But that's just speculation at this point.
We created communication app for the disabled, it's called ParrotOne - www.parrotone.com. We want to give the disabled ability to send sms easier. It's not core feature but it's important.
That site is all in Polish or something, so can't read it. Where's the actual app in question, like a Play Store link for it?