I like DF not because it allows me to build things but how it goes about doing it.
In some roman city-building sim you may be able to build the "aqueduct" building and if you build enough between the river and your city, you get "water supply enabled". Check.
In DF there is no aqeduct building. If you build windmill-powered pump works attached to an overland channel on high pillars or dig a subterranean channel to the river, you invented the aqueduct.
Or a subterranean version of the Niagara falls. Or a fortress literally cast from magma. Or a computer powered by... cats.
But how do you describe the ability to engineer for real?
Design and build dams, power plants, plumbing, and traps that would never make it past the geneva convention?
I know for a fact that a lot of people are just not compatible with that way of thinking. On a recent trade show some company was handing out small metal boxes with sweets or whatever.
They had an obvious lid but no handle or device for removing it. There were a lot of people simply... staring at theirs. And that was not an effective way of opening them.
So looked at it. No handle. Round. No obvious way to apply pull or torque.
Remaining option: pressure. Press on lid.
Box opens.
DF is totally compatible with the engineer way of thinking. You use simple elements like gears or pumps to direct force, flow, or pressure.
The results can be amazing, terrifying, or worst case... fun.
To me, DF is what LEGOs will be when they grow up.