Textbooks aren’t just for children. (Adult education is woefully underoptimized.)
"Figuring out your interests" isn't the hard or useful part. The hard part is changing your default (usually harmful) interests into something useful and productive.
That involves lots of psychology and (yes) manipulation and coercion.
The cognitive nihilist in me shudders at the thought of a technocrat deciding what my own best interests are.
"Your best interests are the games I like to play, not the games you like to play."
Which is a fine position and all that. The objectionable part of it is the pretense of objectivity.