Agreed. A few lines of dialog would have done the trick. But plot holes are part of what made me want to start making up my own answers (and writing them down), so I’m kind of glad they’re there.
I’ve also filled in the blanks in Jerric’s Cyrodiil with Kvatch as the center for Alchemy and Bruma as the former seat of Necromancy. Kvatch is such a great place for an alchemist, even one who is not blessed by the Atronach.

I think the events of “A Plot Revealed” also suggest the necromancy connection, plus wouldn’t snowy Bruma be a natural for preserving the necessary spare parts?

In the realm of make-believe I had Sutch as the Enchanting training center with Spellmaking as a specialty reserved for an entirely made-up city, but the Sutch chapter never made it to posting. Now a couple of years later I’m glad I left the altar-assisted magic out of my version. I think made-up schools like Communication, Transportation, and Applied Magicks would be more fun.