If the series wasn't cancelled, do you think Mason, Hettie Cutburn, Osran and Vitimir should've gotten episodes focused on them? It would've been nice. It also would've been great if they were given voice actors.
No
Why not?
We don't need to
We don't need to because why?
Because we don't need to know about every Coven head?
Well, it would've been cool if those four Coven Head Witches were given spotlight attention and even dialogue to say.