mexxico thank you for the elaboration of workshop profits
This video (pause it when you open it) is at about 4000+ days in game, after 100 hours of play. Clan tier 6, all fiefs controlled by Khuzait with me as vassal. The brewery in Vostrum is at +495 / day, you can see the others in the list. I'd say none of them have been nerfed, and interestingly while tanneries were strong early game, they leveled out to be worth far less than the brewery by late game.
You do have to consider where you place a workshop, the current market, and stage of the game when you place a workshop. It may not be working perfectly but it's getting there. Of note here is that I have a wool weaver that's making more than 2 of my tanneries.