Oratory1
I think KS4 and KS5 are focused on targets and goals and jumping through hoops to access the next level of education.
DD (Y10) is already aware of what GCSE grades will be required to get into sixth form, and her friends discuss the value of extra-curricular activities for a UCAS application (although their advice is mostly inaccurate and out of date).
For DS2, the super-curricular stuff he does is just him pursuing his interests and passions. Even if none of it had any relevance for a university application, he would still read New Scientist every week, watch online physics lectures, problem-solve on Isaac Physics and read the latest science books... just for his own interest.