...and having a snorkel hanging off of your mask while diving in strong currents is a great way to ensure mask leaks or even having the mask ripped right off of your face.
I see it as If folks want to use a snorkel while diving, then they should. However, they need to understand and accept the implications/tradeoffs that go with it and plan accordingly. I personally don't wear one as I find them incredibly annoying - but I can see someone wanting to have one for surface use/surface swims (though I'd suggest a folding one or some other way to store it (not on your mask) once under water).