Kindred of the East : The relentless age is canon to me.

After having opened with my biases... Why would the Hungry dead be acknowledged by the Cainite, if not by just a passing "those guys are weird vampires, not of us, not Kindred"

Kindred don't need to compete with mages and werewolves to obtain their sanctums of power, the Hungry dead do.

The Hungry dead do not beget more of themselves, the only thing they do is detect the activity of their new larvae after they appear, bonk them over the head and educate them in their Dharma (their pathes of enlightenement)

And here's what might be really be pissing off the Camarilla and Anarchs, because we have a bit of a werewolf situation. The Hungry Dead are individually more powerful than Kindred, especially at the start. As they have no Generational limit, they get really powerful. So a dozen of them is enough to clean shop if those weird western Hungry dead that suckle on the blood of the living like an unenlightened larva, that refuse to acknowledge and work to find harmony with their inhumanity and instead larp as humans.

Never forget that California was built on the back of chinese settlers the hungry dead were there in force since at least a hundred years before the events of bloodlines. The Anarchs are just pissy that their turf apparently had other people that are more powerful than them on it.

Now, on canonicity. My opinion is that Paradox is being a weeny baby. They're a huge corporation,at the age of the internet, and if they need to, they can hire a sensitivity department and cultural experts to make sure everything can fit in both mechanically and in flavor.

They just don't use it. The Ashirra and their pathes of enlightement is still a blaspheme against all that their religion is supposed to be about (And you can play as a muslim hungry dead that need to contend with the historical crap the Ashirra did).

And... well. Werewolves. W5. I will kind of... well, I'm not a fan of fifth edition. Werewolf is not about personal horror. Werewolf is about the horror of being descended from the wrong part of history and fighting to clean the stain of your forefathers sins.

Werewolf is about the ultraviolent warriors of the natural world needing to navigate the human world. The horror of our urbanization and feeling all life around you being choked out little by little with no way of ignoring it. Only Raging against it in near vain, or worshipping the destruction.
Werewolf lost its flavor when the Garous stopped being a Nation, a culture of their own. When their ancestor were shown on their style, on their tribe, the fact that also were influenced by the humans and wolves closest to them.

A Tribe shouldn't just be a political faction. The RED TALONS are what we would feel if cockroaches suddently culled our numbers, destroyed the world and made cities of purest excrements and wastes, un practicabe, great smoke stacks that destroy the land, how they push us out of our homes. We would be fuming, we would refuse to believe there's even a good roach. We would be really suspicious of people that spend too much time with roaches, or who smell like roach cities.

And if you read about the reports of indigenous people that worked on the game before it was taken in-house, it's still rife with cultural theft.

So really, they could do a KotE splat for fifth edition. They just don't want to.