DuckHairback wrote:
My daughter does imaginative play. Whatever she's into at the time. She'll assign us roles or characters and tell us exactly what to say and do. I'm not allowed to improvise which I find unbearable. The whole thing is weirdly exhausting.
That sounds a lot like putting on a pretend theatre play. That's an excellent role-playing game. She's the director, and writes the script; you're the actors, and you perform. Ain't nothing wrong with that. That's her game, and by agreeing to play it, you agree to follow the script.
I remember myself doing the same thing. And my family tried improv on me like you did on your daughter.

Which I hated. I quickly gave up trying to make them actors, and delegated those roles to my stuffed animals. My family became the audience instead. Even though that turned my plays into glorified puppet shows, I was mostly OK with that.
My plays changed little as a result: the stuffed animals simply stood in for humans playing the same roles, and I (male) was a voice actor for all of them. Occasionally, although not often, my older sister (by 10 years) joined me as a voice actress for female characters. And even then, I wrote their lines.