I edited my comment to make my point more clear, since I think a lot of folks don't know what a PM does.

If your PM isn't defining a clear strategy, your PM is probably inexperienced and/or overloaded. It sounds like you might have experiences like that.

I think a good PM needs three big skillsets: Customer discovery, Strategic planning, and leadership alignment. The second and third are easier to learn academically. This kind of role is ideal for learning the first.