I don't do anything at scale. I don't have to scale. My core competency is as a library or tool builder, and often my primary deliverable is a tool or library.
In the past year I got a new JR engineer on my team who was all hot and bothered with docker and k8s and he spent a month changing out CI process to be docker based. It went from a 20 line shell script to a pile of garbage.
I disagreed with the decision at the time, and while a subject matter expert I'm not the team lead so I couldn't say no stop that's bad.
While I'm sure k8s solves problems for Google I'm not google. My company isn't google, and my team isn't solving that class of problems so docker is useless crap for me.
The person is no longer on the team. They left their docker mark, and ran off to dockerify some other project leaving a team with no container expertise and a CI pipeline that is hacks around docker bugs.