My first street bike was a 92 ZX11. The MSF instructor said I would be dead in a year. That same year he was almost dead in the hospital from crashing his Z1 dragbike at the strip. Bars through his chest. I learned throttle control with the 11. Used to ride with a lot of kids on 600's, 750's. I was usually out front away from the chaos. Many of them crashed and lost their interest in sportbikes. I already had a lot of dirtbike experience when I got a street bike. Have had three 11's, a 6, a 9 and a 10 and 12 for Ninjas. Had all sorts of 80's and 125's as a kid. No dirtbike for about 8 years then got an 01 KX250. Then a KX500. A KDX200, then another 250, another 500, then an 06 450, Kept adding to the collection.
If you ride a lot of different bikes you as a rider learn to adapt and to work on your skills. When I get to ride, which is not often enough anymore. Most that go with me are KTM and Yamaha guys. Rarely see any Kaws out here. I'd say 80% of the crashes I see are people just pinning their 4 strokes WOT and not being able to handle it for the terrain. So it wouldn't matter if they were on a KX500 or their own bike. Its discipline and control. I rarely get over 50% throttle on the 500. Don't need to. Ride it like a 4 stroke and just navigate. One thing to note. Have heard so many stories of people breaking legs and ankles on 500's just starting them. Turn the gas on, tilt the bike to the left side till gas runs out. Stand it up, put it in 2nd gear and rock the bike back and forth. It usually will fire on the first kick.
Works on my KX250 too. Especially when its cold out. Course the KDX200 starts on the first or second kick regardless with no method involved. Got to love that bike.