even with filtering inserters there may be situations where one assembler or refinery gets all their resources snatched away from it's neighbor.
I suggest mirroring airport central luggage transport systems where everything goes through a core machine, is addressed and packed into a transport sled to be shipped off to the proper terminal.
This is currently possible only with roboports and as such extremely expensive energywise.
For this, we need
- item addressing
- belt splitters able to read the address and understand which belt an item needs to go
Instead of inserters grabbing everything their target has set as required, the item itself will tell the inserter if it's to be grabbed compared to having to set up intricate systems to keep your item flows separate.