YunoHost call themselves an operating system so I'm just going with the flow... 🙂 I guess they put it like that to explain why you have to install it as an OS?
Basically Yunohost is Debian plus an ecosystem of pre-installed and pre-configured softwares such as nginx, postfix, firewall, etc., plus a webadmin, diagnoser, backup system, plus our own packaging system and app catalog (plus "meta" stuff like the community)
So we tend to say that we're a (GNU/)Linux distribution yeah, it's not just about webapp packaging
A Linux distribution (distro) is just someone pre-selecting the packages, software, and configuration, to ship, with a Linux kernel, as a working, running, usable system.
By that definition, it's unconventional, but still fits the bill. Just instead of being intended to be run as a single system, it's meant to host other app packages.
Interesting. I kind of figured it would go the other way.
But I'm quite happy with the way it works now. I like that the underlying O/S is the familiar and well-tested Debian that I have experience with. I've had to use that to get things working properly in a few cases.
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