mouse sensitivity was definitely affected by fps, and atleast according to https://docs.unity3d.com/ScriptReference/Input.GetAxis.html
there is no multiplication by delta time done before giving it to the user.
Yeah that's the confusing thing, it was kind of the community vs. Unity on that one. If I update this game again I'll look deeper into it but I think I'll just have to let the sensitivity slider be the solution, and keep working on my new game for now, where I have better debug tools to test stuff like that. 👍 Thx again for the feedback.