I think these things are hugely hugely beneficial, whether they take them seriously or not. I'm pretty lazy so never became good at these things but thanks to my parents making an effort I know what it feels like:
To play a musical instrument, piano and guitar
To sing in harmony
To stand in the wings of a play nervous to go on
To ride a horse, showjump, hunt, drassage, pony club, carriage driving
To dress in a leotard and feel what ballet is like
To windsurf, wakeboard, canoe, kayak and sail
To attend brownies and do my badges
To camp and put up a tent
To swim, play tennis, play hockey, rugby, cricket, football, to ski
Etc
These are not my greatest skills by a long shot but from when I was a child and for the rest of my life I can relate to people and converse with them on almost any topic. It's very clear when you meet someone who has not had these privileges as they show a lack of knowledge and usually interest in any hobby which is completely understandable if you don't know what it feels like to experience any of these things.
So doing classes in anything and everything is not necessarily about becoming a master of things (which is amazing if it happens) but having a feel and memory for many experiences.
It's one of the greatest advantages in the life of an adult.