I think its a personal choice. But I also think that an animal deserves, at the very least, to be able to do what comes naturally to them without our interference on how we think they should LOOK affecting how they were meant to function. And I also think its a SHAME to MESS UP an entire breed of animal - ANY animal - and what they were originally bred for because we, as humans, think they should LOOK a certain way.
For example, I used to show setters - I did field trials and my husband hunted with my FIELD bred setters, and I did conformation shows with my SHOW bred setters. Our field dogs were the *originals*, and maintained all the traits they were bred for a century ago - loyal companions and intelligent athletes - they weren't much to look at, but they trained easily, would do anything I asked of them, and they would hunt their hearts out all day long without batting an eye. The show dogs, although I loved them and they were fun loving dogs, they couldn't hunt to save their life, and were a nightmare to train in obedience because they lacked focus - but God they were pretty dogs! (which fits in with my opinion that conformation shows are merely canine beauty pageants) Just an example of what man can do to an animal over generations of "selective breeding" - show setters simply have had their original purpose bred out of them over the years, in favor of what some perceive as "beauty" - and because of this, IMO, field setters and show setters should be two completely separate breeds.
Now, I'm fairly new to poultry, so my opinion may not mean much, but from what I've observed thus far, showing poultry has, over the generations, followed much of the same path as showing dogs. I realize they're both domestic animals, but I think about whether or not they could fend for themselves, avoid predators or find their way home were they to be turned lose or if they escaped. Or God forbid, what about a natural disaster? I dare say, my EE's would probably fare MUCH better than my Polish or my silkies, just as my field setters would over my show setters.
And I believe that our interference on how an animal LOOKS should not affect their health and well being. This page is just but one example on chickens:
http://www.browneggblueegg.com/Article/HoleInHead.html. And here is a BYC thread on the subject:
https://www.backyardchickens.com/forum/viewtopic.php?id=191416&p=1
I don't have silkies with vaulted skulls or huge crests - actually my silkies have fairly small crests and would be considered pet quality my most. But they're happy, healthy, normally functioning chickens. My Polish, however, do have those big beautiful round crests that are favored in the show ring - they are stunning birds, but its really quite pitiful to see them walking into things and trying to find their way out of the hen house when I open it up in the morning, simply because they can't see the door. My silkies are at the top of the pecking order in my flock, and push many of my larger birds around - I truly love my Polish chickens, but honestly, they couldn't fight their way out of a wet paper bag, even if they had to. For that reason, they are kept separate from the larger more aggressive birds.
Now, I'm a dog groomer by trade, so making animals look pretty is my business. I've been doing it for almost two decades, but these days, I'm more about an animal's health and comfort than I am about its looks. Sure, I want my clients to look nice, but I want them to feel good and function properly too! I don't like to see show dogs with their long hair up in wraps any more than I like to see crested chickens all taped up with hair tape. I'd much rather just let dogs be dogs, and chickens be chickens - and this means letting them all live and play outside on the grass and in the dirt. So I cut hair, and I cut feathers.
But this is a chore that I would rather NOT have to do - it stresses the animal out and I'm taking a chance on injuring them just by trying to help them - but if that's what I have to do to help them, then so be it. Its the price I have to pay in order to keep them healthy and comfortable, and the price I have to pay for wanting to keep certain breeds. Will it stop me from breeding them? Probably not - but I only hatch a few chicks here and there for myself and my friends, and I don't show, so current fads, breed standards, and judges opinions mean nothing to me. WHEN I DO breed, its for health and temperament first, egg laying/reproductive ability and resemblance of breed second - and if they grow up to be absolutely gorgeous birds to boot, then that's just a bonus! But keep in mind, beauty, after all, is in the eye of the beholder.
Just my two cents...