2D Games to visualize your reality from a different perspective. Similar to reading a book versus watching a movie. Where your subconcious mind fills in the blanks which are not spelt out. Similar to how when you dream and you hear a noise in your bedroom. And your subconcious mind will incorporate that noise into your dream.
In some cases when I have had the option to play the upgraded 3D version of and old 2D games, I prefer the 2D version. Because I do believe it has some strengths over the 3D interface. 2D appeals to your imaginative subconcious mind. Whereas 3D is more directed to your conscious which is reality based.