Plumbing is unlovely. It is unlovely in all aspects except, perhaps for the appearance of external feature such as an elegant turn of a faucet or bend of nozzle. “Nozzle.” Even the words of plumbing are ugly.
Parts are surprising non-standard and change over time. Basic parts. Like the bits that go inside the wall. But how many choices do we need to turn water on and off and keep it from leaking? And plumbing parts are ugly. Clunky, badly textured, and awkward to manipulate. As are the tools.
Not only do most plumbing jobs require nearly every basic tool, but they often need a kitchen utensil or two. Like a turkey baster or skewer.
Also awkward are the spaces the plumbing is in. Once one is wedged into the cabinet or next to the toilet to reach a nut, it may be impossible to gain enough leverage to actually turn the damned thing. Once wedged, it’s nearly guaranteed something vital will be out of reach: a tool, a locking nut that has to be held, one’s sanity.
After several hours, an unplanned wet and messy eruption or two, and at least two trips to the hardware store, one doesn’t even really have the satisfaction of a finished job, because if everything was done correctly? It will look exactly the same as before.
Yep. New filler valve and flapper. Oh, joy.