It will certainly have it, and earn style points. Like I said, I'm not against it, and will likely waste a great deal of time with my own ineffective WOW factor stuffs....
But after I caught up on the thread here; I was getting the feeling that some aren't really anticipating just how complex this notion of mechs will be, given the details of the game mechanics that's we've been fed... I forsee some of them being off-put from starbase altogether, once they realize its closer to space engineers than it is robocraft... one "elbow" with a limited range is easy, but when you start adding shoulders, wrists, hands, hips, elbows/knees etc, and need to consider Every DOF(degree of freedom) plausible?
https://www.instructables.com/id/Programmed-Robot-Arm/
A functioning, fluid, mech will require a Healthy understanding of kinematics, coordinate systems and vectors (xyz/ijk), compounded rotary joints and their limitations, trigonometry to bind it all together and script it... and even after all that, it's not going to magically function with your WASD input; you'll require TONS of individual inputs for every required minuscule movement... taking a a single step will be at least 3 or 4 axis activating at specific degrees and intervals with precise timing....
TL;DR: I agree, tons of WOW factor but, Yea, mechs will be HARD...