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You can absolutely design trusses to have an attic. They're called "room in attic trusses".

I would guess the decline in livable attics in new construction is mostly attributable to changing consumer preference.

At least where I am, I would attribute it to code requirements. A livable attic requires much more work to meet code than a vented attic space. Not to mention the energy cost of having a livable attic can be higher because there is no venting and limited insulation. All of this is speculation of course. You definitely could do it. But, if you did you'd almost certainly have to use more expensive construction techniques to meet code insulation requirements.

On top of that, a usable attic is a third story. Once you go 3 stories, you need a fire sprinkler system installed.

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