Seems a simple question, but I can't find it in the docs anywhere. A number of functionalities are noted as being Editor Classes, which means that one has to import a secondary namespace (in C#) to use them.
Okay, that's no problem -- but what other drawbacks are there? Are these editor classes slower? Only available when run through the Unity editor, and not as a standalone app? In other words, what is the practical reason for separating these out as a whole separate branch of classes? Or is this just an organization thing?