or as a luxury one wants to afford, for example, I am gladly willing to pay the extra price for a 23.5-degree warm bath, even knowing that it could certainly be optimized.
It is quite simple, everyone has a baseline for which they are willing to pay or consume more beyond what is necessary, even if it is not required.
I don’t need an iPhone 12 but I want to have one, but I could just as well walk around with an Android phone like 75% of the population.
It’s the same with the necessary temperature in our house. Analogous in this case, an Android phone is enough for us :)
It only becomes critical when you want something but cannot afford it and still consume it.
It is only luxury if you cannot afford it. That is fundamentally not the case :)