Ok, I'll bite......
I have been a motor officer for 6 years. I have been riding since I got my first mini bike at age 5. I have ridden street, dirt, trackdays, long distance touring, twisties, flat track, and have competed in numerous police motor competitions with a stack of trophies laying around from them.
My riding skills are based on much more than the cone work I have been doing for the past 6 years. The cone work and police style training is great for improving confidence with the bike at low speeds; head and eye placement, smooth clutch and throttle control, appropriate brake useage, confidence in letting the bike lean (really far), front wheel placement, and the ability to use my body to weight the bike how I want to, have all been improved by my time spent doing cone work.
However, riding at speed, cornering at speed, and braking from speed can't be learned in cone practice. The confidence to know you can put the bike where you want when you want at the speed you want only comes from riding at speed and obtaining the confidence in your skill set and the ability/limitations of the bike. Being able to balance the bike while at a complete stop has no correlation to determining correct corner entry speed or instilling the confidence to let the bike lean into a turn. Proper front tire placement in cone work really has little relevance to tire placement at speed. Traction concerns at low speed mean diddly squat to me at speed. Smooth clutch and throttle don't have nearly the impact at speed as they do at low speed.
When I first started riding the police motor and competing I was pretty good. Not the fastest but good enough to compete. Wanna know when I turned the corner and became very competitive and started winning stuff? After taking a course from Rich Oliver at his Mystery School. Two days of sliding around Rich's tracks on a little Yamaha 125 chasing my buddies and getting comfortable climbing all over that bike to gain speed, somehow correlated to me vastly improving my cone work. So much so that I bought a couple 125s and built my own track in my backyard to continue to go sliding and racing my buddies.
While I routinely encourage riders to practice their low speed skills, riders must also gain confidence at speed to be well rounded, successful, and safe riders.