A "life lesson" may still have a non-universal set of (common) situations to which it applies.

You don't agree that the more specific a situation is, the less applicable to 'life' it is?

I disagree with the conflation of "applies to life in general" with "applies to every situation you could be in." I would say it is, for example, a mistake to interpret lesson #2 as "never choose delayed gratification," but it is very important not to overvalue it.