Strop technique conversations are primarily read by newbies. For them, I think the "hold tight and strop light" advice is good advice. For undoubtedly, if the strop is bowed and you strop with pressure, I think most will agree it quite possible to dull the blade. So, why not give general advice that is most likely to keep newbies out of trouble?

As an aside, the closer the blade is to a wedge, the more slack I allow in my strop.