Just a general suggestion, in addition to the filter maybe it would be cool to blacklist certain items. That way you can set up big "splitter" setups using filter loaders and using warehouses from Angels.

Except for snapping logic my loaders will only use base mechanics.
Blacklist and circuit connections are not part of that (yet).

When this does eventually happen, lane filtering would be useful. Output a different type of item in each lane. Or output just a single lane of one item without having to side load. Just a thought.