Its a beautiful system but where my head explodes (and has been exploding for 4 decades) is over the following scenario. So in Johnny's system, I assign 21 to automobiles. My VW van gets 21.1, my Citron is 21.2, etc. and the insurance for each car gets a .8 so 21.1.8, 21.2.8, etc. And I assign 13 to Money. Insurance belongs under money so 13.5 is insurance and life insurance gets 13.5.1, E&O insurance gets 13.5.2, et…
In reality you just decide. One feels better to your brain. And you tend to remember that.
It helps of course if you remain consistent. In the systems we design we’ve realised that most people want the insurance close to the thing being insured.
So in our life admin system we have health, pet, home, motor, and travel insurance as IDs alongside your records for those things. Seems to suit most people.
And don’t forget you’ve got your index as a fallback. I don’t remember most of these numbers but I just launched Bear, typed `insurance` in the search field, and there they are. Now in three clicks I can get to my home insurance which, turns out, is at `12.12`.