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Why DAC cables over Cat6a or Cat7

They are the lowest power way to connect SFP. And they are cheap.

Though I'm not sure I would pull them as they tend to max out at around 6-7 meters. I use them to connect systems within the same rack/room.

Floor to floor in a house isn't too bad with 6-7m, but I suppose there's always the AOC cables that are 20m+.

10G Ethernet seems to be really hot, all my SPF+ connectors are hot, my TP-Link 10G switch is hot. It seems not be efficient anymore in that regards.

While my 10G fiber and 10G SPF+ DAC cables are perfectly cool.

I hope this is temporary but 10G Ethernet seems hot. I haven't seen anyone write on this topic yet but it is my findings.

It is well known that copper 10G runs hot. Use DAC or fiber if you want run cool