I think two mottos that were chiseled into stone on the Temple of Apollo of the Oracle of Delphi are helpful.
- Know thyself.
- Nothing in excess.
All the rules listed by the OP are helpful but only in context of the student’s (and parents’) having a good understanding of the student’s abilities, interests, weaknesses, and strengths. Make sure that the applicant on paper fits the applicant her/himself, and that the key aspects of the student’s talents and achievements are documented or documentable.
But the applicant is not a god, and shouldn’t pretend to be perfect.
Many things can’t be known – including what the applicant will be doing 5, 10, or 20 years after graduation. The economy, and the world generally, will be changing, so the student needs to keep an open mind. The college years are ones in which the student takes a giant step outside the home, becomes substantially more self-guided, but not completely self-sufficient. Careers evolve after graduation.