learning on a 22 is not hogwash, its not necessary for everyone, but neither is it hogwash. If you are teaching yourself its much easier to do with a 22 than a 40 cal. If others are teaching you that's a different story. Taking the big bang and big kick out of the equation when learning is ALWAYS advantageous no matter who you are.
Keep in mind less than 11% of shots fired by Police hit their targets. these shots are fired by trained individuals and at close ranges. Shooting a pistol is not easy to do. the first time I tried, I used a 357 magnum and shot the end off my shoe. thank goodness there was extra material or i would have lost my foot. now i can hit targets at ranges most would never believe. the 22 did me a lot of good, and still does.