The only situation in which I can see that being truly useful is where:
That seems to be a pretty narrow use-case! But one which I just so happen to be considering embarking upon, so I’m delighted 
Yup, we needed it ourselves for a specific use-case so I left a note here. Glad it might help 
I can see this in meta.discourse.org, but not in our own instance. I checked and we’re both using 3.2.0.beta2-dev. Do I need to explicitly enable this behaviour in settings?
Hey Aidan,
You’re right, I see the behavior only on Meta but not on other sites. We’ll do some digging and come back to you.
Hey Aidan,
I can confirm that there’s no setting for this behavior, but it can sometimes be erratic depending on case sensitivity or if there are multiple words in the category name. @JammyDodger and I did some testing to find that it can help if you:
Type the full name of the category to make the “+x categories” option appear
If your category has multiple words, enter the first word, add a space and then the “+x categories” option should pop up
Does that help? It isn’t ideal, but we can get this fixed once we’ve tracked down all the edge cases here.
Long thread, not sure what the conclusion is. As of today, a category tracking setting is not propagated to its subcategories. Is it on the roadmap? That would answer a real need.
The functionality is in there, it just is a bit hidden unless you know what you are looking for.
Have a bit of a play around with it (the last couple of posts clarify it a bit)
I’m not 100% sure it’s working at the minute? I’ve just had a test to check (iPhone/Safari just in case that makes a difference) and it’s not offering me the docs subcategories along with ‘documentation’. Does this work for someone else?