The description of these behaviors is termed the mechanism. When scientists are not provided with such a mechanism, then a description of a process, it's explanation, or it's understanding, is questioned. Astrology does not work with mechanisms. It works with relationships, patterns, tendencies, and interpretations. It does not always give a yes or no answer.
I hate the Drawing Canvas and I understand that it's not backward compatible, so I never use it. To turn it off in Word 2002 and above, go to Tools 4 Options, General tab. Untick Automatically create drawing canvas....
Inking, now has more to offer in Word. Along with draw, write and highlight, you can now use touch or a digital pen with Windows digital ink to edit documents directly in Word 2016. This is available on Windows touch devices and devices that work with digital pens such as Microsoft Surface.