I just find it unneeded in general and personally think this is not worth the time or bytes, just saying that I would be pissed off if I had to stop being able to utilize copy and paste in posts so that people who insist on using MSword can paste from documents formatted in hell.
Now that I think about it, you can just create a bbcode for people to use who insist on pasting from MSword which would strip all of the formatting.
I just don't see a need for it when anyone with a computer already has the tools on their local machine to make this not be an issue nor do I think that people who take the time to learn how things work should be punished (and have to spend more time when pasting text that is actually formatted in a way that makes sense) so that a smaller group of people can do what they do without learning anything.
Best of luck to you and no I am not joking about that either.