This could also be said about the Enterprise in Star Trek or the Millenium Falcon in Star Wars. In fact, this accurately describes every vehicle in fiction. This however has never stopped a specific group of fans to draw detailed schematics or deckplans and write detailed articles or even entire tech manuals on those ships and every minute detail of their technology.
It's as valid an angle to view a show as concentrating on any other aspect of that show, e.g. character-development.
You're right of course, although Doctor Who
has always been significantly less interested in its own technology than Star Trek
, and has never bothered to come up with a cohesive, credible or accurate explanation for why its technology works. It just does. Watching Doctor Who
for the tech is like watching Scrubs
for the medical content.