Supply and demand
Once upon a time...
The vendors supplied 40Gbps and there was little demand.
The cloud providers demanded 25Gbps and started building lots of servers with 25Gbps links and using 25Gbps top-of-rack switches.
On the desktop we are seeing a similar battle for 2.5Gbps and 5Gbps where support for the higher speeds over Cat5E may see them become the new standards.
And the battle was over...
Biting the hand that feeds IT
