I mean, symmetrical to a plane that connects the first position from a hole (orange hole) to the centerpoint (see attachment). Indeed it is just a mirror feature that you use but why is it available in a rectangular pattern and not in a circular. Doesn't seem logical
It's available because a rectangular pattern requires you to define 1 or 2 vectors, about which it must be fairly simple to apply symmetry (perpendicular to the pattern's direction vector(s)).
The circular pattern is a bit different because the plane of symmetry could be 1 of 2 perpendicular axes since you're defining an axis of rotation. Say you use Z as the axis of rotation, do you mirror about X or Y?
I agree completely with you, but the dialog would require more input from the user, if the code would even allow for it. Call GTAC and log an ER - that's about all you can do for now and hope it eventually gets implemented.