To design the core UX for a system, you should understand its userbase. If you're stuck in a paradigm where there are documents instead of applications, where

To design the core UX for a system, you should understand its userbase. If you're stuck in a paradigm where there are documents instead of applications, where closing things doesn't terminate them, and where the default switching hotkey doesn't allow you to switch between windows of the same application, it affects how you perceive the whole system and puts you at odds with your user base.