Alpine is great. I have nothing against systemd but Alpine stands on it's own for containers and VMs. I haven't given it a try on baremetal but I imagine it does just as well there. Not really desktop focused but if you want to run it with a GUI on a laptop it's technically possible.
Simplicity mostly. It just works. It feels so clean, nothing running there that is not supposed to be there. Installing something takes only sub-seconds, because packages are small.
I believe your questioner was specifically referring to your assertion that audio on Alpine is unusually good. It is a somewhat odd observation, since ALSA is entirely a kernel API and Alpine is using the same kernel as everyone else. The only possible source of audible difference would be not running Pulseaudio, which resamples audio (some say, badly). However, you can install Pulseaudio on Alpine, and you can not-install Pulseaudio on most anything else, so it wouldn't really be fair to call that a feature of Alpine.
Note this is only an issue for docker images using non default tools. Not good but not unique, for instance here is another high scored CVE for PAM issues in Ubuntu/Debian https://www.cvedetails.com/cve/CVE-2009-3232/
I challenge you to find any decade+ old OS software community you couldn't make the same comment towards.
