Well, there is a large and well-developed industry of getting high school seniors into colleges. There are a lot of people who gave a lot of thought to the issue of how to present the best image of an applicant to the admissions office. These people write books, give seminars, offer consulting, etc.
I don't think that what I wrote is out of sync with what these people say about extracurricular activities. For example, the founder of AdMISSION POSSIBLE writes
"When it comes to extracurricular involvements, it doesn't really matter what the content is. Anything from doing a major DNA research project to volunteering at a school that serves low income students to excelling at fly-fishing is legitimate fodder for college application grids. No matter the activity, colleges look for quality of involvement rather than quantity of activities."
As far as I know the general consensus is that extracurriculars matter. Not enough to compensate for bad grades or low SAT, but if you're applying to a college that's in the right range for your grades/SAT, the extracurriculars matter a lot
This is my understanding as well.
You seem to be ignoring what is, basically, existing literature,
How? What does the existing literature say that contradicts what I wrote in the post?
Are you quite sure that you understand the issue in sufficient depth to give advice to other people and maybe even charge for it?
It's possible that we should investigate in more depth, doing a more thorough review of what others have written, but we've already done some of this.
[Edit: The post below gives the impression that our conversations with admissions officers are our only reasons for believing the claims. We've also consulted with other sources such as How to Be a High School Superstar: A Revolutionary Plan to Get into College by Standing Out (Without Burning Out) which corroborate the admissions officers' remarks]
We spoke with admissions officers at Harvard, Yale, University of Chicago, Columbia, Stanford, MIT, Duke, University of Pennsylvania, Dartmouth, Williams, Johns Hopkins, Swarthmore, Brown, Northwestern and Caltech, about how they evaluate student participation in extracurricular activities, for 15 colleges total. Some things that we found based on college's statements are below.
Kawoomba suggests that colleges' statements on the first point below can't be taken at face value. What do you think?
Cross-posted from the Cognito Mentoring blog
See also High school extracurricular activities: factors to consider and College statements about extracurricular activities