That's not true. Industrial can utilize different materials to achieve that look. It's not concrete only. One could use metal,steel,copper,aluminum,concrete,wood,brick for example. Walls can be exposed brick, steel, normal drywall if mixing up separate styles(rustic,farmhouse,modern), etc
Sometimes tile is used like (penny tile) in bathrooms.
Floors can be wood, concrete, stone.
Decor can include usage of black pipe fittings which are seen everywhere, cooper, hammered metal, cast iron, antique hardware(gears,pallets,old machines) propellers, leather, etc.
I understand industrial, but I also have a budget and making things by hand stays within it.
Thank you very much