Nope

Have not got a MW in a while. For a while, I was getting 3 to 5 a week on one crafter.

As with all things RNG, it ebbs and flows.

I'm still getting writs pretty regularly on my crafter, usually several over a 3-5 day period, since I dont empty the rewards every day.

There has been no appreciable change in the writ drops that I have seen tracking my 10 crafting characters. The past 8 weeks has seen no more than a 20% variance week to week, and looking into the past few months that appears to be a decent average of variance - I had two horrible weeks in the 12 I just checked, but I also had three really great ones so...

As far as knowing motifs go here is some hard data to consider. (I have been tracking this for months).

My main "Breggan" knows 58 motifs and averages about 125 vouchers per week. I spent over 2m on motifs for this one.
My secondary crafters know ONLY base and rare races, plus 5 others and average about 68 vouchers per week. I spend around 700k for motifs on each of these.
My third tier crafters know ONLY base races and average about 54 vouchers per week and I have spent nothing on them.
My last group of three only have SP spent on the Mage-based crafting skills, and are farming surveys for the other three - and they still average about 26 per week. This group knows only the base races as well.

Obviously Breggan does all the master writs, and in the past 4 months I have only had to stash 5 writs that I did not have the style for yet.

All characters have all the crafting achievements except JC, which only Breggan has at this time since JC vouchers are worthless (value vs cost to create) so all toons except Breggan are only doing JC writs for the surveys it garners.