1000 is a critical juncture where confidence grossly exceeds ability. This is similar to the "one month anniversary" in relationships these days, where the couple are on a euphoric high having passed a milestone, but they haven't really encountered any critical challenges yet. They basically only scratched the surface of things and not delved deep into matters that determine the long-term health of relationships. (I had an ex that celebrated the anni. of our relationship on a monthly basis, which is why I used it as an example. On month two, she picked a fight with me because I didn't greet her with a "happy two-month anniversary!!" I thought, "are you f***** kidding me?" We lasted only six months.)
From my observations, the three things that accelerate learning are starting on a slower bike, riding meaningfully more often, and training. I find that the kids who start in dirt bikes/100's competitively have the best motor skills. As for street skills, that's just something you pick up over time. Having good motor skills helps significantly with execution when the pucker factor is high. For instance, in an e-brake situation, a rider with poor motor skills will most likely stomp the foot brake and slide themselves into the obstacle.