There is so little information about Jonah Magnus and his pen pals and most of the fandom finds their episode the most boring ones.

Alas there is that charm of Georgian and Victorian era and it is so delightful to sparkle supernatural in this specific time periods. So what if you have to be putting a lot of interpretation and wish fulfillment into it. It is very intriguing creating theories and headcanons and fanfics set in this era specifically!