The people who come up with this "stuff", just stuff it where it fits in the build. If they had to work on it, they would figure a better plan.
We purchased a new 2500TS last year and wanted to winterize it. The water pump was in a basement compartment, convenient as h___. They could have put a winterizing port in, but save a few pennies. I managed to re-plumb, but it was not easy and I had to change several fittings to get it into 7.5". It would have been very easy in the build and less in the landfill.
The cold low point drain had a valve inside the compartment, the hot water low point drain was capped off underneath the camper.A male fitting and a cap vs a 1/4 turn valve? Makes perfect sense. I added a hot valve drain in proximity to the FW drain valve in the compartment. Don't have to crawl under the camper now.
Thinking, if they didn't put in a winterizing valve, they didn't put in a hot water tank bypass. After locating the water heater under the kitchen sink, I very delicately had to pry a nailed shut finished panel. The good news? They did install the WH bypass. But why make it inaccessible by permanently nailing the panel? I have modified it to be able to get it open without being demolition man.
But, if we didn't have these little quirks, we wouldn't need this forum. Be thankful, folks, we have both!