Because the coaching market is available after another season.
This is like saying you're going to do all of your Christmas shopping at 3 o'clock in the morning on a random Tuesday two weeks before Thanksgiving. All that matters in the end is that you get the right presents that your family wants (that's the big difference in this hypothetical, it is NOT the thought that counts in coach hiring). Maybe you know exactly what you need to buy and you can get it online somewhere. But all the stores are closed. If you just wait, all the stores will be available to you, there will be big sales, the world of Christmas shopping will be open. Why force it now and risk narrowing your options to things that your family won't like?
But if the right presents are purchased in November, then what's the problem?