Paper is an always-there, always-on, never-obsoleted, never uncharged, high-light/low-light, durable, unbreakable device with inegrated modular sharding and really, really, really shitty search features (though creative indexing can get around this somewhat).
(Some of the newer e-ink devices ... are starting to address a few of paper's strengths, particularly use under brightly-lit environments, increased durability, and whilst not never needing charging, both going long stretches on a charge and reviving quickly.)
There remain risks. Few paper-based notekeeping systems suffer from integrated keyloggers, data exfiltration, or ransomeware attacks.
What makes paper far more useful, I'm discovering several years in to a still-only-semi-organised Bullet Journal practice, is indexing.
Find a way to highlight where relevant data are kept, and note things there. The Bullet Journal itself strongly leverages, but is not limited to, time-based organisation. My strategy generally is to begin temporal content at the front of the journal, conceptual or topical content at the back, working toward the middle. (Exceptions to both rules can of course exist.) The index, which begins at the front (and can be extended to any arbitrary location within the journal, though I've found 1--2 pages more than sufficient, having allocated 4 initially) points to either specific items or waypoints (e.g., monthly spreads, possibly weekly if you want to go that way).
There seem to be two primary schools of BuJo use. One is principally concerned with aesthetic. I'm concerned with utility. My journals are brutally practical, and anything but works of art. They're useful, however. (And I hope to make them more so with time.)
Having recently acquired a larger e-ink device (Onyx BOOX), I am finding its notetaking capabilities ... surprisingly attractive. (I'd bought it strictly as an e-book / e-article reader, it does very well at that also, of course.) It's become an idea-development space. But isn't seriously challenging paper yet in other realms.