My stack inserters always get stuck pulling out ingredients because they're always "Waiting for more items," which can cause bottlenecks. Assemblers that produce more than one output always cause problems with stack inserters.
I propose one small change: stack inserters will prioritize grabbing ...
It would be neat if the filter inserters stack size was limited to the signal quantity, meaning more products than required wouldn't be put into containers if the required amount wasn't a multiple of the current stack size, the only workaround at the moment is to put the stack size to 1, which takes ...