Most users probably prefer the “new note” option to default to the last notebook they were in, and this is ok for the desktop version, since I typically have the time to first think about what notebook I want to add the note to first, but on iOS, I’d love it if the long press ‘new note’ didn’t automatically default to a particular notebook and would remain “uncategorized” (unless I take the type to assign it to a notebook.).
I’ll typically use the mobile version quick notes, and dislike them automatically going into notebooks I had previously been using. Not a real big deal, but it’d be nice to have the option in advanced settings “default new notes to uncategorized” or something like that.
A default notebook might be very useful for times when you "share" something with Joplin. Finding where the shared item was placed can be a challenge now, but having new notes always go into this default would be a real pain for me. I want my new note to go into the notebook I'm currently working in. I don't want to create a note and them have to move it, or be working in notebook "ABC" and have my new note end up elsewhere.
I don’t know how some sort of “quick note” could be implemented in Joplin. Any old text editor that saves locally would do a similar job and then share the notes with Joplin at a later time. What would be needed is a way to avoid the lengthy startup/sync time of Joplin.
Adding a new note with All Notes open (which isn't a notebook) makes the note end up elsewhere. Having an optional default notebook feature would fix that. For those who don't want a default notebook, selecting which notebook should contain the newly added note would prevent the issue. I look forward to when notes cannot be created in the ... notebook (when Conflicts was the last selected notebook) as a result. I think that's better than replicating how Trash prevents the issue by hiding or disabling the add buttons (which I'd argue Conflicts should do as well).