Been diving since 1978, never once had a snorkel entanglement, a seal hasn't tried to steal it, my mask has not been pulled off by it, I have not gotten bent because of it, a shark has not attacked it, eels have not slithered down it, amorous sea snakes have not tried to mate with it, it hasn't opened up a vortex in space/time in the Bermuda triangle, aliens have not probed me with it, nor any of the other malidies mentioned. (And I dive in kelp most of the time.)
Bottom line is, everyone's equipment configuration is different, depends on the diver, and what they are doing/where they are diving. Halibut hunting on a beach dive, you're gonna want a snorkel, penatration wreck dives, probably not. If you are instructing, standards require it.
Some people like 'em, some people don't.
A few beaches require 'em, most places don't.
Do what you want.