Why would you assume Alpine is only used for containers? I use it for my own local home server, as it's very lightweight and easy to tweak to how I want it.

I'm not a fan of using Alpine in containers.

Use it baremetal for your servers and desktops, then use Debian/CentOS containers on top when something is missing.

To make sure that once services are up and running, they keep running and are restarted automatically? To have good, centralized logging? To manage in-container services the same way you do on the container host?

There's plenty of good reasons for one to want to do so.