I honestly believe a lot of it is down to his age. He seems to have a very "traditional" methodology in relation to how he believes things should be done.That's what we do. But the argument being made is that Brentford use player trading as a regular source of income, that the reinvestment is worth it. Thus far they have been correct.
Hemmings could do this if he wished, he can employ whomever he likes, including very smart analytics minds. Which is why it is so frustrating that he doesn't.
I would be very interested to know how his stables are run and what sort of analysis goes into the breeding and training programs.