I was riding stock from 15 to 18. you can see from my video on youtube, that I've progressed and I only really rode an Echo control so its not like its the bike changing the way i ride. and I've been back riding about 2 years on a Mod and YES im not upto the level i was, I wont ever be. I could side hop about 3 inch above bar on my Onza ice, now on my Monty its totally different. Not sure whether its the bike, or me....
BUT if you at a level where you can say "yes Ill try stock and see how it goes" go for it, I loved it! (in my head i should be riding a stock, but money is tight!!)