The production specialist boosts the following 3 job types: Crafting, construction and art. The requirements for the specialist list only: Crafting 6 or construction 6.
https://steamuserimages-a.akamaihd.net/ugc/1841409905609415178/76D511A08524638EE54D1A46385F7E401E7AAA92/
Either it was an oversight that art is also boosted - since it boosts "general labour speed" which includes smithing/tailoring, but also stuff like art, cleaning and smelting AND the +1 quality which also affects art, since its a craftable with quality - or it was forgotten to add it the requirements. Given how the role is presented, it was likely not meant to boost art.
My hope is that art is instead included as a possible requirement instead of the art boost being removed. Right now cooking is the only skill without a specialist and I hope art is not added to that list. I am not even sure how well known it is in the community that art is boosted, since the specialist presentations sounds very industrious and not arty.
Both DLCs, no mods used.
Thanks for the report. I am not sure if this is intended or not, but will add it to my internal document for a review of the system and if a clarity or mechanical change is needed!