To clarify a bit - "platform dependent/hard to run code" exists in java land. Docker is good at managing native dependncies.
I'm also assuming folks reading this have had some context around microservices and k8s. Microservices no matter what language are well suited to containers and container orchestration. It's a widely used pattern to have self contained services in containers with some sort of orchestration managing the containers those services are deployed in.
Those "facts" were targeting an audience that have at least some familiarity with containers and the basics of the problems they solve but maybe less familiarity with the JVM (which from my experience is the typical reader on HN).