That is true, but the current situation is simpler. Design for disassembly and repair is expensive, time consuming, and difficult. It is far easier to have robots slap components together. That is plenty of explanation for phones now shipping.
Is it really cheaper or is something we were told. There are repairable phones that are not more expensive because of that, if you mean we can make this phone or laptop 2$ cheaper if we use glue instead of a screws then we can agree that we want to pay 2$ more to have the ability to swap the battery or keyboard instead of replacing the entire or half of the device.