Let's say that Kubernetes is 15 years old - just for the discussion.
Why did they land on the number 12? How much difference does 12 years yield, compared to 10? or 8?
When I see these somewhat arbitrary large numbers of years, I can't help but think that the laws of diminishing returns start to kick in.
Maybe instead of years, they should look at the actual work and experience people have done. Instead, use seniority levels.