No, I think this is more "don't show up at NFL games expecting the coach to throw you on the field because you play in a weekend league."

Probably because you didn't read the logic. I said individual, not professional. If you want to be a HFT, great, but if you are an individual, non-professional investor, you should stay out of short term (less than 10 year) trades and probably invest in index funds.

The analogy to programming is that if you need a spreadsheet, as an individual you should get an app that does that, not write it.