I changed the action mouse pointer on my website to this on April 1st.
I didn't bother removing it. 😆
app are both routers, per se. However,
router refers to a separate router instantiated specifically for plugins to use.
When NodeBB reloads, the plugin router gets regenerated, while the application router does not.
This allows plugins to be both activated and deactivated without a full restart.
... You also cannot overwrite existing application routes in
app, though you weren't allowed to do that for awhile now.