I see what your saying but I know it was once written up somewhere that you would be given a list of every facility your qualified for that has a vacancy. That’s why so many people are still under that impression. Maybe it did change now but it used to be the other way and if it changed it wasn’t well communicated.
It's right here on this site:
NEST SOP
The Air Traffic Controller Resource. ATC forums dedicated to sharing information and building an online community.
pointsixtyfive.com
Maybe that page needs to get changed? Althought I think that graphic comes directly from NATCA...