Cheaper to ship small replacement parts then make quality stuff. If I never see wood plugs for shelving again I'll die a happy man.

I have a friend who literally makes these decisions for our local IKEA. He is empowered by the company to “figure out how to make customers happy.”

I recommended someone request a 1 inch wire shelving black post sleeve pair from Ikea, after they posted a wanted ad on Freecycle & I measured my OMAR wire shelf. They got the part but it wasn't compatible - ≈22–25 mm (0.87–0.98 in) 😩