In my experience, the trick is to move them without disassembly or with minimal disassembly (removing only moving parts like shelves that are planned to be removed) like any other furniture. Nothing weird with that: Most traditional furniture items made by a carpenter would be equally incompatible with disassembly.
Likewise, if you're not planning on moving then you can make Ikea furniture much stronger by adding wood glue between the pieces during assembly. That way it stays tight and nothing comes loose or flexes.
You clearly haven't tried moving with your local "designer furniture center" "high quality" furniture. IKEA is pretty much as good as the "quality furniture", when it comes to moving.
