There’s nothing to extrapolate here. The description is BS. There’s no such thing as ‘linear plane’ there’s a flat plane and curved plane (with positive and negative curvatures). There’s a thing called linear algebra but it’s not the same. Also planes are 2 dimensional spaces. When you have more dimensions name ‘plane’ doesn’t apply. If you extrapolate BS you’ll get even more BS

No. He shows how non euclidean (spherical) space translates to euclidean (flat) space. Description is bullshit.

So power users can’t use GUI?

It optional, for power users. That the point.

Go install TempleOS