I remember reading a similar article a very long time ago, back when "reading an article" usually meant reading it on paper so have no recollection of where or how to cite it, and it had a similar list.

One that stood out was that in Silicon Valley having your company go under was not really much of a setback, if at all.

In many other places in the US that looked like they had the ingredients to be a Silicon Valley if you led your company to bankruptcy, that was what did them in. The money folks would not be interested in financing you again, and you'd stop getting invited to the social and business events that the successful people get invited to so your ability to network would take a huge hit.

Startups in those places tended to be focused on safe things like trying to do something slightly better in an already well established area.