hard to make in mass production? I think Ikea doesn't agree with that (i think Ikea designs are often inspired by Bauhaus, at least that is what they say here: https://injarch.com/archives/9326 )
Hard to make in injection, press, lost-wax, lithography, or 3D print processes, perhaps.
Basic geometric shapes with matte surface and least mount of edges are ideal for lathe and mill works, while being basically torture tests for the rest.
Ikea products at times are similarly styled but actual Bauhaus furniture used very high quality materials.
In a room I have dreadful Ikea bookshelves (a temporary measure to store books while looking for a better solution) next to a pair of original Wagenfeld table lamps. The difference is craftmanship is stark.
Ikea's thing is good design and quality for the price. They have more expensive higher quality products as well. They don't have every quality in every category, though. And their products mostly don't have stupid flaws, they have been torture tested.
Try buying (aesthetically) well-designed furniture at !Ikea, it will start at 2-3x the price and you have to go higher to get really good build quality.
Indeed, the arts-and-crafts style furniture that my parents bought when they got married is still in use today, with minor repairs and some refinishing. The Ikea-style furniture that they also bought (veneered particle board) is gone.
