[wasabi991011]

If you want to use a niche, academic definition of "usable", that's fine but you better be ready to explain yourself.

Because in general, "usable" means "people use it". Which they do for Obsidian without community plugins without issues.

[eviks]

To make an actual counter, you need numbers. If only a tiny niche of users use it without community plugins, then yes, it's unusable (in a practical definition of the term)

[joemi]

If that's so, then without numbers, it's neither usable nor unusable.

[eviks]

Indeed, if you don't know anything about use, you can't say much about usability.