It would be nice to have a separate Community space for Arcade.
Currently, posts related to Arcade end up in the community space where the user is implementing their expression. This makes a certain amount of sense, but there's often a lot of crossover between the various contexts, and sometimes a user's issue is specific to Arcade, and is less about, say, ArcGIS Pro or AGOL.
To differentiate between the subcategories of Arcade posts, there could be a series of labels for the different profiles.
"Dashboard Expressions", "Popup Expressions", etc.
With Python, for example, we differentiate between standard Python and the ArcGIS Python API, and accommodate each with their own space. We don't have users post their python questions in the ArcGIS Pro / AGOL spaces, etc.
I believe it would make the various Communities on here more useful and focused. Users looking for help with anything Arcade-related would be able to look in one place, and users who aren't fiddling with Arcade, but are trying to do something else in Pro, or a web map, or their dashboard, will have fewer posts to sift through in those spaces.