>You can also construct with hardwoods in a way that prevents warping and cupping, like using rift sawn cuts and orthogonal grain joiniery.
No, you can't. Not if you're making IKEA furniture that customers assemble themselves.
>I think you mean plywood, not particle board. Very different things. Particle board is crap.
No, it's not, if you're making inexpensive furniture that customers self-assemble. Good plywood is very expensive.
>I’ve built a lot of my own furniture with hardwoods and none of it has warped in a decade.
Great, let's see you make something that way that ships in a flat box, and which some idiot can put together with pictogram instructions using no tools except a screwdriver for turning cam-lock fasteners.