I think you are not completely disagreeing with the most important part of the message: knowing why you are doing something. When young, you can be trying lots of news things, e.g. drugs, casual sex, going to Tibet, etc. etc. either as a clueless youth (which is how it's done mostly) or doing them for consciously in order to learn from your experiences.

The options become less less as you get older, obviously. In fact I think the best description of the change in career outlook as you get older is a switch from breadth-first search of new experiences to depth-first search.