I think its important to start out with .22 so a shooter doesn't develop bad habits like flinching and trigger jerk. But once a shooter has developed those habits just going to .22 isn't going to erase them.
A shooter then needs to do a series of exercises designed spedifically to help unlearn those bad habits. And be constantly mindful of good technique everytime they shoot until good habits become ingrained.
It's more than just picking up a .22