Etiquette may as well be a river in Egypt. It's rarer than unicorn poop. It's why I gave up on first light fishing. It doesn't matter how much effort/sacrifice I put in to getting up at an ungodly hour to get to a prime spot early, never fails that some douche is going to saunter in at 9am, stand less than a rods length away, start casting over my line, not waiting his turn and cutting off my drift etc etc.
I like the solitude and relaxation of fishing and it can be done when you come across a good bunch but it seems a rare occurrence. I'd rather hike for 20-30 minutes and have some peace and quiet and catch 2-3 fish over a day than battle it out at one of the meat holes to limit out in an hour.
Some people are more than happy to ruin someone else's day in order to do what they came to do. A lot of selfishness out there and the sense isn't always common.