Spy Fiction Sub-Tropes

So the page for Spy Fiction breaks down the genre into the various sub-genres. I noticed that only two of the sub-genres have their own pages: Tuxedoand Martini (the classic spy story) and Stale Beer. Now I can understand why many of the other sub-genres don\'t have their own pages, as they are mostly variations on the other two. However, I feel like the Bathtub gin sub-genre (Where civilians get caught up in spy work) could be considered its own trope. Am I wrong? Is there a reason why only those two sub-genres have their own trope pages?

Just a guess, but I suspect that the lack of pages for the rest is due to nobody taking the time to make them.

Usually the main reason why something doesn't have a page is because no one has made one yet.

When it comes to splitting off content from a main genre page onto a subgenre page, then it also depends a little on how many works there are.

A difference here is also that the Spy Fiction page is an indexed genre page, while the subgenre pages that exists are written more like trope pages (I'll leave whether genres are technically tropes aside, but they're treated as tropes on those pages). This is why examples can be duplicated, as normally an example should only be on the subtrope, not the supertrope.

Bottom line is basically if you think you can write a proper page for them with enough examples to justify a separate page. Considering the other pages are treated as trope pages, examples also need proper context, which isn't always necessary on indexing pages (like genre pages often are).