Revenue per employee.

Blockchain protocols are in their own class of efficiency because the goal of protocols is to bring down the headcount to zero. Blockchains are a step in the chain of many steps of automation and replacing manual tasks with machines.

Eventually the number of employees working on a protocol should go to zero.

But this time, the automation threatens high-skilled white collar workers like bankers and regulators. It is politically much more sensitive topic and thus it is expected to receive much more regulatory pushback, like self-driving cars.

For example, I feel Bitcoin "employees" is already close to zero, as there is no need for much new innovation come out from there anymore, and the protocol is fully ossified.

I wrote a boomer-friendly article explaining the topic some time ago, as this is the key principle what makes blockchains valuable: