summerends That's absolutely right of course. As someone who is in both camps, you prove that one can't contrast this as a simple opposition (i.e. academic = all theory, whilst non-academic = practical, initiative, teamwork, grit, determination). I know many scientists (and some of the rest of us too!) in our Senior Common Room who have exactly that second list of qualities, and it's possible to develop both via both routes. 'Teamwork' may be the exception (though not in lab practical work of course).
The point is just to be accurate about the current state of Oxbridge admissions, where extra-curriculars are not as relevant as they are sometimes thought to be. If I'm offering advice about how to make a realistic application, then in this particular case, it would be sensible to focus on subject-related activities which allow applicants to develop and practise the sorts of qualities which are listed in the selection criteria. They also need to think about how to hone their skills and aptitude in their chosen area, just as one would do with drama or sport (I'm often surprised at interview by candidates who don't seem to have done even some very basic preparation and 'training' relevant to our set of procedures - the sort of thing you could easily work out from the advice given on the website). I'm not sure I see much of a difference between academic and non-academic, it's just horses for courses.
I don't want to give the impression that the admissions process is 'easier' than it is, but it is often depicted either as irrational, or full of hidden 'codes', or of an impossibly high standard. 15 years of experience tells me that that is not true. I too am looking for exceptionality (which we tend to call 'future potential') in students who may not themselves realise it yet. But in order to have the chance to find that future potential at interview, we need to see the widest possible range of candidates who are in the right ballpark for entry. And I think that ballpark is somewhat larger than is often depicted, and that it is possible to prepare yourself for admissions, just as a sports player or musician would prepare themselves for a competition.