but why do Skylar call it 4D printing... When it's just a normal 3D printing process with smart material. It's just me with grouses on the way this conversion technique is being marketed...

In the market , EPP , Foaming materials (just a few examples) for injection , extrusion processes are already commercialised where the materials properties change after processing for lightweight down gauge applications .

You are right though for highly complex design materials, 3D printing is the way to go in the long run, assuming the cycle time can be cut down drastically.