Bolded is funny..so if a kid is playing SS and batting third for the Firecrackers but doesn't go to hitting and fielding lessons they won't take them.. I am sure, even nowadays, while few and far between some of those types of kids exist, especially if their parents know what they are doing from an instructional standpoint.
I would guess a large majority of players on top-level 12U and older TB teams in So Cal are working with a hitting instructor.You can bet that nearly every pitcher at this level is working with an instructor, as are a lot of catchers. Fielding instruction at this age is more rare, but some do extra work at the local regular high-level clinics in the area.
As they get older, fewer and fewer parents are working with their DDs the same way they did when they were young.