How different people approach workflows is fascinating.

For example, your "not all that different from looking at all (recent) heads" implies that the number of (recent) heads isn't far off from number of (would-be-)branches (i.e. no random offshoot experiments, stashed-away debug sessions; whereas I make many of such continuously (were stashes on git (with occasional grumbles about not being able to stack stashes), regular commits now on jj (maybe with a special-format description, if I bother)));

and that you (even if subconsciously) try to ensure that the head of a branch is always identifiably-representative of the branch (i.e. don't put some random unrelated change at the tip with the idea of "I'll put this in a more proper place when I get back to this").

Effectively, using the full commit graph not as a place where anything potentially-useful can stay, but rather by itself a complete picture, with things not fitting into it going into.. idk, just being abandoned, to be found by looking through the op log? commit IDs saved in an external file? wading through evolog / scanning through `jj show -r xyz/2` etc?