It was kinda easy to get your head around the OS just navigating through the system folder. The UI was also more consistent than anything we have these days.
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I think we're talking about different things here. The UI might have been superior in MacOS, but the technical foundations of Unix clearly were. Something OSX tried to (belatedly) reconcile. Nothing stops you from adding an awesome UI on top of Linux (although I'd say UI will always be a matter of personal taste and prior experience).
Serenity is far more interesting.
To this day, Haiku has been dragging its feet on the Pi (and yes, I know it’s a community effort, that it requires sponsorship, suitable volunteers, etc. - I’m just pointing out that they dropped the ball in even acknowledging the need for a port).
For the rest there are some interesting native tools such as video editors.
But Haiku needs 3 things to get more real life use cases:
- GL/Vulkan for older Intel (both old and new)
- Async USB
- UVC webcams