There is book called "The Design of Everyday Things" that discusses such things. https://www.amazon.com/Design-Everyday-Things-Donald-Norman/...
I don't even know if it is a cheap product thing as many of the cheap products are very usable. For example, light switches are very cheap. People place them in strange places or in strange orders and it makes them hard to use.
For some reason, the style fell out of favor. Not even to high-tech showers, just to single axis systems which blast water at high heat and trickle it for cold.
This sort of thing really is a usability failure, providing a slightly cheaper and simpler product for the median consumer while harming anyone with vaguely non-standard intentions.