If you use a Microsoft application, like Word, you can right click and choose to paste as "Keep Text Only". This allows you to paste content and keep the same formatting as whatever line or area you are in.
The clear formatting feature is nice, but in many scenarios - the content within the email has been formatted beyond General Settings. For example, a Header that is a different color and size than the general body content.
It would be very helpful to be able to paste as text only - so that the content reflects the formatting that you have your cursor next to.