DAC definitely has that problem too. One cable in an ideal condition probably wouldn't be that hot, but as soon as something is not ideal it would get hot.
Also you are just throwing everything here now, DAC is totally not "we can have 10G for free". As others has said, the main benefit of 1G/2.5G is what it uses the same twisted pair => 8p8c connector. 10G DAC is SFP+. This alone prevents the mass adoption in the consumer sector - too much friction for Regular Joe.
Also you are just throwing everything here now, DAC is totally not "we can have 10G for free". As others has said, the main benefit of 1G/2.5G is what it uses the same twisted pair => 8p8c connector. 10G DAC is SFP+. This alone prevents the mass adoption in the consumer sector - too much friction for Regular Joe.