I believe his point is that you can generally carry whatever protocol you want over port 443 (and often port 80). Given how many other things are broken by ne

I believe his point is that you can generally carry whatever protocol you want over port 443 (and often port 80). Given how many other things are broken by networks that foolishly only open port 80 and 443, and their (in my experience) relative rarity, I'd suggest that it's not worth bothering with, except possibly as a fall-back to measure the actual number of people trying to use your service behind such a network.