I submit that not only should it be legal, but that it is good to do so! More seriously... You write "but who are good enough to be clearly understood". Have

I submit that not only should it be legal, but that it is good to do so! More seriously... You write "but who are good enough to be clearly understood". Have you considered that perhaps they are only clearly understood in their own minds? By definition poor communicators (speakers/writers) have trouble getting their point across. If they get their point across well, they are not poor communicators.