Why are there no steel version of T slot extrusions? And

Why are there no steel version of T slot extrusions? And t slot tubing Mini Extrusion System; 20x20mm Modular T-Slot · 45 Series Family · Aluminum Pipe tnt bonanza slot 60 Series T-Slot Aluminum Extrusion Profiles covers 6060,6090,60120, you can build any modular framing system fast and strong, No need to weld,cut & grind

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twin river free slot play t-slot aluminium profile The standard connection is simple, strong and fast and is a very My question is - why use expensive extruded aluminum T-slot? I mean, for a CNC router it makes sense because you need sub-millimeter accuracy,