> Pages are stored in a folder structure, like in an outliner, and can have attachments.

I wish this model worked for me, but the concept of "pages" just doesn't. I would immediately get into a situation in which I'd need a sub-page for an aside.

Is this a problem for anyone else?

I am currently using Dynalist to solve this, but very annoyed by its proptietary nature. Is there any free software that successfully implements this "infinite outline" approach?