[ExI] Four personality types?

[SR Ballard]

> 
> You can sort any collection of things into a number of arbitrary baskets. Whether or not that categorization is useful is another question.
> 
> -Dave

The only real conclusion they seem to have drawn, if the article is reliable in reporting the findings, is that personality changes over time. I imagine due to life experiences. Which doesn’t seem very actionable to me because I feel like that was already established.