Just preference.
My birds have to be able to see above easily as they free-range.
With SFH, if you have a crested-to-crested breeding you can end up with vaulted skull, excessive crest, and even death. This kiddo doesn't have either excessive or vaulted skull so she shouldn't have a problem w/free-range. I just don't want to take the chance that I would breed an excessive crest in the future. I've had one before that I literally trimmed the crest back so she could see. But she, and her mother, both had "skittish" personalities that made them "hawk-bait"...crest or no crest. I guess this kiddo will be my chance to see if the personality is "normal" in the crested birds.
@oldhenlikesdogs
How many birds do you have totally? How many are roos?
Goodness, time to spill the beans. I had to pull out my notebook. I have 3 large breed roosters currently, 2 buff Orpingtons one barnevelder. 32 various large breed hens, including some polish which get their crests trim and do some pretty aggressive free ranging. With my large breed flock there are 3 d'uccle roosters who mostly keep to themselves and two bantam cochins who are trying to be flock roosters. I also have two bantam cochins who are extras and are penned by themselves.
So my free ranging flocks have plenty of roosters to give the warning, never lost any to hawks, I had some coyote troubles a few years back, my husband finally was able to get a shot at it and it stopped. Two years ago something was going into my bantam coop and took two hens before I noticed, I believe a Fox, we closed the run door and it stopped. We have goats and donkeys in the same shed, so that helps somewhat.
In my bantam flock I have 4 bantam cochin roosters, and 10 hens.
I have 6 bantam chicks coming and two bantam eggs set to hatch.
I have 19 large breed chicks coming, two roosters included, and about 10 eggs set to hatch but I don't think most will hatch due to poor shipping.
I have 8 muscovy hens in need of a drake eventually.
I have 15 turkey, 5 toms, 10 hens, and some hatching eggs coming.
I went a little nuts this year, I don't know if I mentioned it here but I'm a cancer survivor, for now, and I'm fulfilling some desires, that get it done while I still can because you never know stuff. I do have room for all the chickens, but some turkey toms will have to become my husband's dinner at some point I think.
I once had a crested vault silkie, she was never right, the others pecked her skull as a chick and she became my special needs chicken, I was relieved when she passed, it was hard on her and me and now I'm afraid to get more silkies so I know what you are talking about, I would prefer not to deal with that either.