Not an answer to your specific question, but something we found very impactful in the aftermath of M10. We got into 3 schools. After we accepted at one and politely declined the other 2, the other two diverged enormously in their responses.
One school was incredibly gracious, asked where we were going (of course), wished us the best, emails from multiple touch points, etc.
The other was radio silent. Their complete lack of response, again despite multiple touch points, felt like validation of having made the right choice not to attend.