Just recently started making evergreen notes and am also currently dealing with the same question. So far I’ve been writing notes on certain processes, which involves a number of ideas and puts them into one note but divided using headers, which creates one long note.
The long note can appear like it’s just one idea because all of the ideas in it seem to just answer the same questions, so I was reluctant to split it. Upon looking at it, it can indeed be split into separate ideas but I’m not sure how useful that can be, and doing so can seem like I decided to transfer some of the paragraphs into a separate note, and that new note would look like it just trailed off from the original note, if that makes sense.
Was supposed to wait and see if future notes would need me to split the ideas into their own notes, but after seeing this post and the replies, I decided to do that and made links to the original note instead. While it makes the long note shorter, I also fear that it’s pointless as I’m not sure if future notes would even connect to these smaller notes or would have just connected fine with the long note.
That said, I’m a bit early in the process of making evergreen notes so it’s a bit much worrying about a problem that I’m not even sure I’ll encounter.