In economics there is the concept of “opportunity costs.” Essentially it comes down to the fact that there are an infinite number of possibilities that one could spend their money on, spend their time on, or, in this case, hire to be their head coach. Once you make a decision, there are any number of options that you’ve turned down. That is the opportunity costs.
It’s at this point that I want to remind the reading public about something I’ve said before. We can only grade moves on the information available at the time. Hindsight is not a good indicator of the wisdom that goes into any decision.