Doubt anyone would argue that consistency is the cornerstone of being able to repeatedly produce our chosen brew of choice in a manner that satisfies our personal quality criteria.
I imagine many of us get a lot of enjoyment out of tinkering with the variables involved, be they dose, grind, temp, pressure, water volume or whatever, the list is endless, I certainly have no problem with experimentation.
What I do find annoying are the pedantic types who insist that it's not possible to produce a quality brew unless you have your coffee shrine set up like a scientific laboratory with the ability to measure TDS, monitor and vary every parameter in the brew chain, be it temp, time, boiler, extraction and tamp pressure, then insist that we should be able to detect differences in the coffee when we change the water temp by 1°C or the brew pressure by 10 millibars.
What I'm saying is if this approach turns you on, great, go for it, however don't expect or insist that we will all embrace this obsessive approach with the same degree of enthusiasm that you feel.
Having said all that, I should mention I'm not a complete Luddite, I do weigh my beans, each of my coffees will contain <> 18 grams, I roast 725 grams of green beans and use a DMM and timer to monitor my roasts, and for the sake of repeatability I also weigh and measure some ingredients when I cook.
So there ya go, that's my Sunday rant, I think I feel better now.