I think all scopes should be first focal plane. Having said that, almost none are first focal plane and that annoys me. Ballistic reticles that only work on the highest power when I am trying to shoot in light conditions that prohibit using the highest power just seem foolish to me.
Calculate your own, for each magnification setting.
Every manufacturer that I have checked into has their reticle subtensions published for each magnification step in the scope.
I've calculated hold points for almost every scope I own, based on the most frequently used loads for those rifles. All it took was some decent "real world" velocity data, the reticle subtension figures, and 5-20 minutes of my time.
Or... do some research next time, before
you buy the scope.