With iPadOS 16 and macOS Ventura threatening to arrive later this month, we’re on the precipice of the arrival of one of the biggest new features added to the iPad and Mac in recent years: Stage Manager. For Mac users, Stage Manager is an optional feature that might or might not improve productivity and organization. No big deal! Use it, or don’t. Meanwhile, for the iPad, the feature is practically an existential crisis. Put simply, Stage Manager is a big deal for the iPad because it gives it windows for the first time, while the Mac has been a window-based computing device since Steve Jobs fi…