From what you have written, it actually sounds like Kraa 'might' be for you.
> I want the process of moving what I've written from the initial medium to online and publicly accessible to be as quick and painless as possible.
With Kraa this is a matter of one click.
> If not, then... I just want it to be a file. Something I can save, archive, move, or whatever, like any other file.
And this is more nuanced, but Kraa isn't using any proprietary file system. You can export your leaves to .md any time. Though it's not the same as e.g. Obsidian where it is literally a local file.
> I want the process of moving what I've written from the initial medium to online and publicly accessible to be as quick and painless as possible. With Kraa this is a matter of one click.
> If not, then... I just want it to be a file. Something I can save, archive, move, or whatever, like any other file. And this is more nuanced, but Kraa isn't using any proprietary file system. You can export your leaves to .md any time. Though it's not the same as e.g. Obsidian where it is literally a local file.