Bug in action
Inserters are inserting their items off to one side, which doesn't matter when using belts but does dramatically change their inserting rate onto splitters.You can see north/south inserters inserting onto the west side, and east/west inserters inserting onto the north side, regardless of splitter direction.
Interestingly, this doesn't seem to happen on belts, on which items are inserted relative to belt direction.
I know this is probably low priority, but it really hinders this unloader design I've just discovered:
Image
For the love of throughput and elegant design, please help this beauty attain its full potential.