The ideal projection is simply 3D, as it accounts for all scales
Unless you have 3D display that is not really true, it is still projected to 2D; perspective projection is still projection and it is not obvious that it's in any way "ideal" for maps
Sure, but it can be projected in a way that minimizes distortion of the current region you're looking at. 3D effectively allows you to choose the best projection from an infinite family of projections, while 2D restricts you to a single projection regardless of your location of interest.
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IIRC the use of Web Mercator is primarily for ease of generating 256×256 tiles.
The ideal projection is simply 3D, as it accounts for all scales, and the geoid if so inclined.
Unless you have 3D display that is not really true, it is still projected to 2D; perspective projection is still projection and it is not obvious that it's in any way "ideal" for maps
Sure, but it can be projected in a way that minimizes distortion of the current region you're looking at. 3D effectively allows you to choose the best projection from an infinite family of projections, while 2D restricts you to a single projection regardless of your location of interest.