BTW, why do I have a browser window? Is it because Iam using Android, or I am running nodebb 1.14?
It's because you're running 1.14 actually. The actual scripts for installable PWA only appeared in 1.15.
However, browsers are confusing so they also offer the option to "add to home screen" any website, but instead of actually considering its manifest for how it's supposed to run and using the service worker properly it will be just an icon to open that website in the browser.
I would've recommended checking this website to see how it's supposed to work, but it seems to be broken in 1.16.2 unfortunately (mentioned in this issue - service worker was moved to its own directory so only paths starting with /assets/src/ are in its scope.)
EDIT: while it was mentioned in the issue #9193, it wasn't the main focus. I commented on it on #9127, solution to which actually broke the service worker
However, NodeBB and Discourse are both somewhere closer to the middle, but on the opposite sides. In both you will find categories and tags, but from what I've seen the emphasis is different - NodeBB is categories that can have tags, Discourse is tags that can have categories 🙂
Hah, this is funny, because that is entirely correct. Discourse wanted to take a hard left at what made forums... well, forums. They took a gamble on thinking that a tag-based approach was superior.
We found that a more traditional hierarchy made more sense from both an accessibility and from an archival standpoint.
It's also easier to support tagging as a separate first-class citizen, as opposed to trying to make tags hierarchical, which is what Discourse tried to do.