A few things I miss for this to be really good are:
1. Folding. A single file will be long. Being able to fold the major sections (# Work, # Private # Projects) would be really helpful. It seems Bear is planning to add folding.
2. Security. One can select all notes under a given tag (for example #Diary), but if they contain an attachment - for example an image, the password based encryption can't be applied.