There's Artificial Stupidity, and there's artificial intelligence accurately simulating a stupid lazy git who won't put his tools back in store at the end of his shift and pinches someone else's if he can't be bothered to go and retrieve his own. After all, one can't have entities with procedurally-generated personality traits and expect them all to be good personality traits, right?
Could we at least wait until we get rid of the accidental artificial stupidity before we go on to add purposeful artificial stupidity? Otherwise, it's just antagonizing the playerbase to create extra micromangement problems when there aren't even solutions to that problem invented yet.
You'd want to make lower quality items because they are faster to make.
I'm pretty sure that the latest update was meant to make metals more scarce. I haven't played enough to tell though, but on surface observation metal is a lot rarer.
Metals are rare on the
global scale. If you happen to embark on an iron vein, however, you have more iron than you'll ever be able to get rid of, because you're pretty much meant to be the entire world's supply of steel. When people use prospector, they come up with something like 15,000 ores of whatever metals they find in their embark. Granted, you're probably never going to mine all that out of the ground, but that's more than enough to pave your roads in steel. Oh, right, and then there's an unlimited supply of goblinite, at that.
Now then, on to chairs. There's no reason you'd really want to do anything less than a maximum quality job, especially not for speed, during the normal course of the mid-to-late game. You have all the time in the world, really, so there's no reason you shouldn't be going for legendary everything at that point. The only time you woulnd't want to care about quality would be during the early game, and during the early game, you can probably just keep the craftsdwarf so busy they never build the lathe in the first place.
There's no reason to create an artificial dilemma of choices when the player will always know exactly which one they want to pick all the time, it's just another set of menus the player has to go through. There's no reason not to automate any decision that isn't going to be a serious decision on the part of the player.