We grew up with a conservative dad who harped about every light, every drop of water, so I learned to be careful with resources. If you simply turn the hot water on and let it run until you've finished with the dishes, then yes, you do use way more...
My mother used to carry on endlessly about things like water usage, electrical use, and heater thermostat settings, and having the fridge door open for more than a few seconds.
She was a good mom, taught us valuable lessons and values, however that obsession with the things I just mentioned is just that.... Obsessive behavior.
Mind you, I'm not against being frugal, or being aware of how much things cost, but I don't obsess over and make myself nuts over trivial, petty stuff.
I do however apply my talents and "perfectionism" to things when need be, and only if they're required in order to maintain important operation, and reliability, mainly in electronics.
For instance, I hand-craft and custom design audio products, one-of-a-kind pieces.
I tend to keep my designs relatively simple, traditional looking, yet with elevated performance that rivals or exceeds mass-produced expensive products, and confirm such performance through extensive and careful testing.
At times, I also "modify" those mass-produced products to compensate for any cost-cutting or shortcuts the manufacturer has done to them.
Below is a high quality level stereo amplifier that I finished a few years ago that produces stunning performance with plenty of power reserves when needed.
Between the internals, I also love doing the woodwork of the cabinetry.
It's actually a relaxing sort of "hobby" that keeps me busy in retirement.
