Further to what’s elaborated above, 2 (in fact 3) things here are being mixed up here:

  1. The booth structure: I still don’t find them a distinct structure warranting a dedicated building=. building=kiosk etc is what I prefer more. Compared to =guardhouse, there is still half as many =security_booth, and a quarter for =booth. Worse, =guardhouse doesn’t actually explain the scale either. Is not useful for it to be used for everything from booths, to large checkpoints and security control centers (are those “guardhouse” too? Not obvious what it means). As exemplified by Wikipedia, File:Saint Michael's Castle Guardhouse.jpg - Wikipedia doesn’t look the same as a booth. It might not be used as such anymore.
  2. The security function/activity: amenity=security + security= has been drafted. Again, amenity=security_booth unnecessarily requires the “booth” structure or scale of operation. This is not flexible, and doesn’t exactly explain what it’s used for compared to the options in security=.
  3. This post has the forgotten police post in its title: police= might be used for non-regularly staffed ones. unlike eg koban in Japan. Rural or borders may have observation posts and bunkers, perhaps with surveillance equipment to maintain continuous oversight.