1″ x 2″ BLACK Smooth T-Slotted Aluminum Extrusion

My question is - why use expensive extruded aluminum T-slot? I mean, for a CNC router it makes sense because you need sub-millimeter

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extruded t slot aluminum 45mm X 45mm T Slot Aluminium Extrusion Profiles · UsageApplication: Industrial · Shape: T-Profile · Dimensions: 45mm x 45mm · Material Grade: 6063 · Material: