Are you able to purchase master Summerset recipes from her for 50 writ vouchers just like you could previously with Morrowind recipes? I've been saving them.
The Morrowind ones are still there and they are still the same price.
This one assumes that the Summerset recipes may only be available in this form probably in about six months - which was about when the Morrowind envelopes were introduced. They were not there at the time we first were able to travel to Morrowind.
If the drop rates on them aren't abysmal or near abysmal like the Morrowind ones are, they really won't need to add them.
I'm not sure how the drop rates are on them but I've seen people post them in zone and guild chats so hopefully they learned from Morrowind and didn't make them stupidly rare.