That does make Cat5 cables typically cheaper to transport and easier to install since they're more flexible without shielding and have a thicker wire gauge. Cat6 has a thicker wire gauge as ...

The solution, as in all matters concerning long distance transmission of data, was CAT5 cable ... is feeding 12V into a few of the wire pairs in the cable and using a cheap LM2596 buck ...

see HDMI cable types. Cat1 and Cat2 are unofficial voice grade standards, while the rest are based on the EIA/TIA-568-B standards. Ethernet wiring today starts at Cat5e. Cat8 is for short ...