It's used a lot as a guest os useland and init inside docker deployments, becuase it's very small. This means you can run a lot of docker images in one machine if you use alpine inside them, fully loaded alpine docker base is about 8mb.
If you have no reason to interact with the userland tools inside a Docker container, you similarly have no reason to introduce their complexity and attack surface in a container designed to run one service.
My current "minimal" installation shows 25 SUID binaries (a large amount of them being systemd related...) and my server services need very few of these.