Am I wrong for wanting Skeletal Deer Wendigo Outfit for killer?

Their culture is very sensitive about people referencing their mythology, especially when it is bastardised as an internet version that doesn't reflect the original. It's best to respect that.

Instead, why not use one of the hundred or so other shapeshifter myths from every other culture in the world that also thought of one for the same purpose?

This. There are a tons of monsters that share the same behaviors, and even stories in ancient Europe, a lot of which play out the same way (just gotta dig a bit)

However I will say this; "Imitation is the sincerest form of flattery"

The Skinwalker as we call it, is a witch, specifically an evil shapeshifting witch. Shapeshifters (and witches) are in nearly all Indigenous American legends, in one shape or another (no pun intended) however unlike most southwest tribes, not all of them are evil.

You can find stories of shapeshifters all over the entire globe, its nowhere near close to being unique among indigenous American cultures. The monster we typically think about is closer to a wendigo (northeastern American), but at the same time also isn't. The deer skull monster is closer to some Slavic/Norse creatures, the goatman is a fine example of a legend that carried over, and happens to be the same thing as some Poncan, or Cherokee Deer Woman stories (there are more tribes of course but I'll just list these two). Completely different cultures, similar types of legends.

If you want a really cool innawoods type of creature, look no further than the Rougarou, which is French for werewolf, a creature told and seen in legends from Indigenous America, Greece, and Ancient Europe (Dogman sound familiar to anyone?)

There's also Bigfoot, which is the same thing as a troll, ogre, wildman, and giant in many old stories, these are just a few examples easily found in old European cultures.

There are more examples, you can even see the Bigfoot creature in old middle eastern cultures, the Succubus legend evolved from a Bigfoot like creature, it stole and ate men, they called it Sulawa. This legend is almost exactly the same as some pacific northwest American stories. Ancient Sumeria even has one; Enkidu, Gilgamesh's best friend, was a Wildman. He was made by the gods to humble Gilgamesh, but because Gilgamesh was part god, and therefore a giant himself, they were of equal strength. "There were giants in those days, and the days after that."

Australia, Russia, China, Japan, and even Korea have a Bigfoot type creature. The legend of Bigfoot has been told about since before humans painted on rocks, all over the globe. No one culture can own that jazz.

A multicultural society that walks on its own eggshells is doomed.

It's worth mentioning though, that at this point, the 'monster in the woods' style creature isn't a Wendigo. By which I mean, there's so many iterations of creepy, youtube-style horror series with weird humanoid monsters all with their own stories and backgrounds etc.

It's irritating that every time something vaguely down that line comes up we get the "that thing is nothing like our myths, but also, that's ours and you can't use it!"

They can have their culture, but they don't have ownership over the idea of humanoid monsters in the forest, whether they can shapeshift, become animals, or eat people. If something is so far apart from what their myths are that they are upset over it not being right, then drop it, it's not that creature so it's not your concern.

"If something is so far apart from what their myths are that they are upset over it not being right, then drop it, it's not that creature so it's not your concern."

I believe the main concern that I've seen was it would be named the same while not being similar enough, which was sort of a double whammy of problems. It would mention the names that realistically shouldn't be mentioned while not being respectful or accurate to the relevant cultures.

Keeping this only around DBD, I didn't even see criticism, just concern. Concern which was swiftly abated when BHVR responded that they would not, in fact, bastardise the myths and would give the killer its own separate (maybe related, maybe not, we will see soon) name, looks, and stories. And I am happy with this because BHVR's original chapters almost always are excellent in terms of themeing, story, etc. Plague, Trickster, and Dredge are all fantastic, and even Knight has some pretty good things going on. Hell, Mid Merchant has some decent lore and themeing going on.

Apologies for the rant, but I had to do something instead of listening to this lecture.

As a rule of thumb, if someone from a culture says "stop using this thing from our culture wrong", LISTEN!

we have the second design being used on many things and many other creatures, from horror to comedy to fantasy. you'll survive having it not be a wendigo.

To that, I don't have an answer. I can speculate of course - likely due to serious mishanding of their culture and related elements in the past, and the insensitive nature with which it's still talked about and depicted today - but as I'm not a part of that culture and just commenting on what I've seen I can't actually give you a definitive why.

Native Americans don't have one big singular monoculture. There are hundreds of tribes across America that all have their own different folklore and mythology. Some may have the taboos, but others don't. Some may want to be "closed", but others do not. Do not paint them all with the same brush, acting like all Native Americans tribes are the same is disrespectful to their individuality.

oh c'mon I can't even mention an entire genre of books by it's name? that is ridiculous.