I've looked at Bullet Journaling a couple of times -- from what I've seen written about it (which I haven't gotten deep enough into to be able to recognize the variants you mention), it didn't look as though it would work for me. In any case the method appears to have been published in 2013, by which time I'd been keeping my to.do file in one form or another for seven years. The format has changed somewhat since 2006, but the basic idea of keeping it online has served me well.

I should take another look and see whether there are any ideas there that I can adopt. I wrote up my format in 2017 (see mdlbear | How to.do it) after someone described it as a sort of online bullet journal, in a comment on one of my weekly posts. I should update that, since I keep finding more ways to extract data from it.

E2A: I should also mention that the emphasis on 2-D graphics has always been a major stumbling block. I have a hard time thinking in pictures or interpreting unfamiliar icons -- that's one reason why I find a Mac hard to use.