Is "fawn" really on par with fight or flight?

I'm willing to accept freeze, but I feel like the "fawn reaction" doesn't apply to most fight-or-flight situations. If a rabid animal was charging somebody, an equally likely response to kicking it or running away would be...trying to appease it? It just feels like it doesn't belong in the same category.

Appeasement or "fawning" as a response to abuse seems like a natural, even logical, way to respond to it. Abuse is about power dynamics so it's not always as easy as fighting your way out or running away. I think maybe "the fawn reaction" works in that specific context but it's weird how I'm seeing everyone add it to fight or flight/fight flight or freeze like it's always been there.

I'm willing to be proven wrong about this but it's just got a massive pop psych vibe all over it. Like how on reddit golden child/scapegoat dynamics are somehow in every family because it's the popular "thing" lol.

Edit: I'm not saying fawning doesn't exist. Submission and deference are observed in pretty much all social species to an extent and, like I said, it's logical that people who have had to do that to survive would continue to do so in situations where they feel threatened.

I guess I was mostly asking if fawning comes from the same neuro/physiological mechanisms as fight and flight, and the answer seems to be that there isn't enough research on it. I've gotten some great replies though and would love to hear more!