I agree that carrying this thing about your neck can have some problems like impact injury, knife coming loose, stangulation, chafed skin etc.
I have not tried carrying it abou the neck mainly because of these concerns. I have adapted it with a longer necklanyard to be cross-slung, rather than be a straight neck carry per se.

As to the knife coming loose, the mora sheath is quite snug, and a ranger band holds the handle down to the sheath.

Thanks for the comments.