Right now I think a common complaint with Dwarf Fortress is that unless you force difficulty on yourself you really don't have a hard time. I think the main issue of this thread is that starting in a temperate calm woodland will lead to a madness-inducing easiness. So advanced players are forced to handicap themselves ("I'll start in the tundra with no booze!"). Throwing in attrition-like difficulties such as the ones in this thread is the best way to keep DF interesting to late-game players.
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Political upheavals, disease, supernatural problems and other things are forthcoming from the devs, but there needs to be many smaller issues like the above. Because once you get your booze, farm, and metal industries up you really have to find ways to entertain yourself.
Seconded! We need some sort of late game challenge, something that works for people who enjoy conflict (army arc), and those who want to build by themselves. Making dwarves more difficult to please is something that will really help the latter.
Besides, you can already assign rooms and such to legendaries, and I know in my forts I tend to take care of them much better than nobles. This is just having the game incorperate that.