That's really strange to me, every house I've ever lived in (5 houses since 1991 , all in the southeast, all new construction) has had an attic and I can't even imagine what a house without an attic would look like. (I guess a flat roof, but only weird modern houses and apartments have flat roofs and there are not many modern houses)
In a lot of contemporary construction it is an uninhabitable space between the eaves and roof. An analog to a crawl space.
In contemporary construction, habitable attics usually get listed as bonus rooms.
The GP is thinking of something reached by stairs. Nonhabitable attics usually are accessed by ladders or ladder like objects.
(Edit: to be clear this is for residential construction which tend to be small 1-2 story buildings.)
There are things called attic trusses:
* https://design.medeek.com/resources/truss/trussgallery.html
You can also use (vaulted) parallel cord truss:
* https://www.dimensions.com/element/truss-vaulted-parallel-ch...
See also various other configurations:
* https://www.menards.com/main/buying-guides/building-material...