Wondering why you would use that over e.g. Notion? Looks like a mix of notion and tiddlywiki (?), but also really stripped down. Also: can you export the entire Roam notes database into text files? (i.e. do you actually own your data?)
1. Compared to Notion, it encourages emergent organization rather then top-down/up-front organization. One of the key features here is how it handles `backlinking`. As I mention a [[subject]] during research, note-taking, diary writing, or whatever -- the page for [[subject]] gets implicitly filled with content.