Part of the issue (How to keep children interested/engaged, while also assuring a more or less uniform practice of availability and standardized educational CV) is that what interests students is a very "per student" thing, and what society wants from schools is "homogeneous CV acquisition."
EG, the society is less concerned that billy and jane like English class, or develop a love for literature. The society wants billy and jane to be able to read instructions competently.
Then there is the whole, "billy is from an inner city with a high crime rate (and is also black), while jane is from an affluent suburban area with a low crime rate (and is also white)-- how do we assure that billy has the same CV as jane (or even has the same opportunities to gain a robust CV as jane)?"
Even with our "Cookie cutter, all kids are cardboard cutouts" approach to education, we *STILL* are not achieving this latter goal.
If we adopted, say-- the German methodology, where interests are identified early, nurtured, and students guided down preset pathways to assure high quality but very disparate outcomes-- we would have the "equality" people up in arms, because it would (by necessity of its design) segregate outcomes, and have strong statistical biases in those outcomes based on population and geographical demographic profiles. (What is interesting to impoverished inner city kids is going to be different than what is interesting to privileged affluent suburban kids, and so, the interest scores for various academic paths will be different, so on a track-based system, you will have wild differences in rates between the two.)
This is getting into the "I want my cake and eat it too." territory. Not every child is a budding physicist, or a writer of masterful fiction, or an aspiring engineer. Some kids really are "Future janitor." Society does not want to acknowledge this, is in love with the idea that everyone should be cookie-cutter equal as children, even when in practice, all this does is disinterest 99% of the student body, and ensure a homogeneous but terrible outcome.