Always nice if you want to cut curves. But curves can be cut with saber/jig saws too. They can also be bent in or laminated. Moreover, chairs don't *have* to have curves.
Don't have to have slanted backs either. For example, the rear legs can be vertical extending a few inches above the seat; the back can be a separate slab or frame that is bolted to the rear legs so it can swing using the rear of the seat as a stop. You could also use leather/canvas/etc as a slingback ala director's chairs. Another way is a fixed straight back upholstered to provide a slope.
So many ways, depends on what you want.