Everything that has come in box from a store like IKEA (or assembled in the back from a box and presented as non-flat-pack) has lasted me less than a decade. I've got a bedroom set that was built out of proper materials and it's almost a century old.
The thing that pushes consumers toward ikea is the consistency and convenience. Most things you can load and cart home by yourself same day. Moving around furniture built by the Amish is a serious logistical challenge by comparison. Maybe you could solo it with a hand truck and some experience, but it's genuinely dangerous to move some things without help. If you aren't moving frequently, the appeal of disposable furniture begins to fade quickly.