I believe this will eventually get added to some extent. Last year, there were little contests to write personality statements for the hearthlings, some of which you can see in the journal feedback. I’m fairly certain @Tom said they’d like to tie these into the units’ personalities and abilities somehow in the future.
With this in mind, here’s something I think could be added relatively easily but would liven up the game world: what if these personalities affected the hearthling’s appearance and animations? Case in point, the idle animations. Right now, they’re pretty uniform and boring. But what if for the Insufferable Academic (you can find old examples of some of these personalities in the old Writer’s Workshop threads), they cross their arms and look around impatiently or pull out a book and start to read? It wouldn’t really affect the gameplay, but it’d be an easy aesthetic addition.