One downside of Ansible on the Pi is that a lot of stuff involves building from scratch, because aren't armhf packages available, or what's available in apt is

One downside of Ansible on the Pi is that a lot of stuff involves building from scratch, because aren't armhf packages available, or what's available in apt is hopelessly outdated. I have a stack at work that takes a day to build on the hardware. With Docker I can build once and pull the image later. I guess you could do similar with Ansible and copy build artefacts over, but Docker is a simpler solution.