FWIW, the author of the original Bullet Journal book has said that people with more utilitarian designs tend to actually use their journals more consistently.
That matches my own experience, in that the more time I spend setting up and maintaining a system, the less useful it is long term. Usually such systems fail the ignorability rule: they fall apart if I’m not able to devote time to them.
Art projects are great! Knowledge management is great! But even if you’re a working artist, combining the two poses some challenges.