Just a short rant:
I haven't personally tried out "Roam", but the underlying principle seems to be just like that of "The Brain", which I experimented with for a brief spell back back in the day.
All in all, I never really saw the point of it: If I am not aware of a connection between two nodes, I will not create a link between the two while taking notes. However, If I am aware of the connection, I am unlikely to forget it. To help myself not forget, I can always throw in a plain-text reminder as a subitem (e.g. "cf. topic"). At any rate, creating and maintaining all those links between items must be a lot of work - and what value do you really get in return? I can always do a search in my database for something I know is related and then read up on it when I need it. Hence, I really don't see the point of this kind of overhead for personal note-taking.
When it comes to publishing and sharing information, though, I guess it makes sense to produce a networked, Wiki-like format. So if you did a lot of that and didn't want to create links on a certain section of your notes from scratch before publishing, I guess I do see the point.
But maybe someone can enlighten me with some specific use cases?
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