Is the concept of the "Bathtub Curve" minutiae?
The concept on its' own is actually fairly simple.Every back yard tinkerer goes through the progress in their own manner if not in the actual construction of the/a graph.
The minutiae of the graph is what is elided or omitted. The minutiae is omitted through what we can call the 'steady state' of operation, eh or the flat line of the tub. To me that flat line represents the lowest common denominator for one, what people will accept in experience of use and two, for what they are willing to or be able to pay for in man-hours to first make and then operate that device through out the life time line.
If one were to make a realistic graph that nice smooth bottom of the tub would look more like a wash board or a saw tooth pattern.
In its' own way the bathtub graph is a lie if it is presented to a public as some be all end all for what to expect from any singular product.
Two short writings on the bath tub graph and it's usefulness;
That curve applies to all complex devices, even human beings.
It CAN be is way I'd put it.
And if I were to apply it to human beings it depresses me and leads me to think about drowning it all in the bath tub.
1693 seems to be the first verifiable reference to the curve involving death rates in some German city.
It'd be interesting to see the reference. Was it some benevolent monk or medicine practitioner tracking the course of some disease taking its toll? Or some malevolent robber baron figuring out how much he could steal from and starve his chattel slaves or serfs and still expect them to produce? Oops kinda sounds like todays world doesn't it.
How is anyone supposed to figure out THE TRUE COST of any product without accurate reliability data?
The TRUE COST has nothing to do with accurate reliability data.
The true cost is what is filling the bath tub.