1) 3d/2d button is a cryptic icon. Solution: Use 3D / 2D button like Google. Click it to go 3D and it says 3D. Click again, it goes 2D and says 2D.
To us a globe and projected map make sense but I don't think it is as obvious for the public. To compound this, the icons are all flat, no color, no texture, as with the whole new Web 3.0 monochrome flat UI look. Not as intuitive or as easy to read even though it's in fashion.