In war, it is axiomatic that the victors of the last war fight the new one with the same tactics of the old. Having won the victor is content with what won for him; but the vanquished wants to know why he lost.
Business and war have much in common. Entrenched companies keep doing what got them there. Upstarts introduce/discover new methods and vanquish the victors.
What worked before does not always continue to be effective. Best practices evolve and change. Look for and/or discover those changes... evolve or perish!