Minor side comments
I don't subscribe to the RDWHAHB ethos. Nothing wrong with it, but it's not me; I prefer continuous improvement (six sigma and others). It's a personality trait.
I have been working in engineering for four decades and I do not subscribe to six sigma. I subscribe to the philosophy of hiring the best and doing what one has to do to keep talent on board because the difference in productivity is often more than ten-to-one. No process will ever replace talent when it comes to producing anything other than also-ran products.
Continuous improvement is bounded by the law of diminishing returns, especially in a company that focuses more on the management of engineering than actual engineering. No revolutionary product was ever created by a process. It was created by talented people with interpersonal chemistry.
Finally, I have seen guys sweat every detail of wort production and then pitch dry yeast. To me, that is a WTF situation. Brewers do not make beer. Brewers make wort. Yeast makes beer. To me, pitching dry yeast after all of that work is pure lunacy. However, that is just me.
In the end, RDWHAHB is about not taking oneself too seriously and not sweating things over which one does not have full control. Brewing at the amateur level should be fun.