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To be honest I haven't spent much time in Unity. Back in the day you either had to parent objects to the camera to make UI, or use a completely different UI system. It sounds like now Unity scenes can be overlaid on top of each other, is that correct?

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Yes, multiple Unity scenes can be loaded at the same time overlaying each other. Physics can optionally be local to a single scene too.

You also don't need to parent objects to the camera for UI. Not sure how it used to be in the past.

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