Or I can make all the siblings bold, but not the first one.
whether or not outlines are expanded
space between lists
They use the structure of the outline to determine formatting.
So if you understand structure, you understand rules.
But it's like programming. Basically the rules work, but you may have to stare at something that isn't working as you thought it should until you understand why it does what it does.
I expect support to be a problem, because people will conclude that the engine is broken, when there's just a bug in their rules. I've had to deal with this myself. Nine times out of ten it's my mistake, the engine is right. And that ratio will go up now that it's been debugged. (Praise Murphy!)