Presumably, the people who actually know how to "operationalize" writing, aren't writing self-help books, but rather are managing stables of prolific (if maybe schlocky!) writers.

I would love to hear writing advice from the managing editor of a publisher of pulp serial-fiction books, of the kind where the writers churn out multiple new books per year. Those books might not be the greatest thing ever written, but certainly they're better than failing to ever publish anything.