> Heinlein's universal person ('specialization is for insects') is an outlier, not the norm, and probably sucks at most of the things they claim to have ability for.

This is quoted elsewhere in this thread (https://news.ycombinator.com/item?id=45482479). Most of the things are stuff that you will be doing at some point in your life, that are socially expected from every human at part of human life or things you do daily. It also only says you should be able to do it, it does not need to be good; but should the case arise, that you are required to do it, you should be able to deal with it.