I was looking at the tank gear design contest winners
Link to Contest Result



the comment for this runners-up design was...

"Design-wise this was extremely cool, but if we were to actually create this, it would be quite difficult to capture the proper design since the number of polygons would be high and cause certain aspects to fall short of the original idea."

what do they mean by "number of polygons would be high"?
what limitation does the current system has?

p.s. i'm hoping to see more gears with glowing parts like ironwork... still my favorite tank gear today.