After dozens of restarts (pick embark location,
embark!, check skills for compatible matches) I managed to get a mason who likes basalt on a map that's full of the stuff. He started at Proficient, and during his run of proficiency -- until he moved up to Adept -- I was able to clock his results as slightly higher than expected. Unfortunately the small sample size makes me suspect that it could just be normal variation.
I'm kicking myself for not setting up a better controlled experiment, and now I'm looking for peasants with good material/item pairs in their preferences to try out the following:
- 100 un-favorable objects (I could just use the figures from the wiki as a control but I'd like to verify what a "normal" result looks like)
- 100 objects made of favorite material
- 100 objects of favorite type
- 100 objects of favorite type, made of favorite stone
I have noticed that placing (e.g.) a native copper cabinet in the room of a dwarf who loves native copper will generate a fairly strong happy thought - this seems obvious and is probably well-documented. Perhaps there is no quality benefit (or an imperceptibly small benefit) but that a "satisfied at work" thought comes more often when working with preferred materials or making preferred items? Don't know how to test this.