Minimalist and consistent UX, incredibly responsive applications, simple and logical organizational structure, with _excellent_ documentation and developer tools for the era.
You boot straight to a desktop, and there's no ads, alerts, pop-ups, pop-unders, noisy task apps, sidebars, widgets, and other engagement seeking focus destroyers. Every app has a reasonably consistent UX and presents as much necessary and relevant information as it can, without tedious wizards or aggressively hiding information behind folds or submenus.
You boot straight to a desktop, and there's no ads, alerts, pop-ups, pop-unders, noisy task apps, sidebars, widgets, and other engagement seeking focus destroyers. Every app has a reasonably consistent UX and presents as much necessary and relevant information as it can, without tedious wizards or aggressively hiding information behind folds or submenus.