It’s pragmatic for most purposes for humans to understand and build things.
It’s a slot-based. Here is a slot. Put symbol in slot. Do not put two symbols in slot as there is no room. Next slot is completely separated from previous slot.
I had very strong anti-excluded middle opinions for a long time but I have reconciled them. It’s all connected at the bottom but if don’t need to work with the bottom, we can skim off the separated parts and work with them just fine. There’s no needed to touch the underlying that-which-connects-all-to-all and really, we couldn’t separate it from it so there’s not much point to messing with it.