I will have a looksee at the cited URL shortly.
Indeed, we should all be critically concerned with control around Vmca .. while keeping in mind that civil pilots generally have no reason to be operating at that limit and ought to keep some margin about the real Vmca for the conditions.
Military folks have a fascination with Vmca for reasons which elude me - most likely associated with the military need to be able to exploit the envelope boundaries for sensible military purposes (which makes perfectly good sense for combat vehicles but not so much for transport) - however, that is not a concern here.
In general we are far more concerned with performance and this, of course, requires that folk make very sure that they don't permit the speed to decrease below OEI targets.
Certainly no offence involved but, at this stage, I am not following the reason for latetonite's post ?