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In examining this article,
Your Serverless Raspberry Pi cluster
It very specifically states
Note: do not download Raspbian Stretch
The community is helping the Docker team to ready support for Raspbian Stretch, but it's not yet seamless. Please download Jessie from the RPi foundation's archive.
The question is in the title: Why the warning not to use Stretch?
What is it about Stretch that is not compatible with Jessie?
It looks like the docker support for Debian 9 on Raspberry isn't "production ready". So the article advise against using Stretch.
Reference:
Debian 9 = Stretch
Docker = Containers, kind of a virtualization, but not really.
Explaining Docker: https://en.wikipedia.org/wiki/Docker_(software)
