The Norotos J-arm and Rhino swing arm have wobble/play in them.
The combo of the Wilcox mount and Norotos PVS-14 Dual Dovetail adapter create a rock-solid, wobble free platform.
This is something that makes a huge difference when using my PVS14 - but if you are going for an impression, there is no need for it at all.
My 2 cents.
ps. Love your new banner Karma