You can use this argument against anything you don't like. 'A well-designed system should not have X therefore you don't need Y.' When 'A well-designed system

You can use this argument against anything you don't like. 'A well-designed system should not have X therefore you don't need Y.' When 'A well-designed system should not have X' is just a matter of opinion, or doesn't acknowledge trade-offs that might make X the better option than Z, then this isn't a useful argument against Y.