One issue that is a hassle in vanilla is figuring out what a blueprinted setup needs at any given point and getting those items to the site without having to fiddle with logistics requests/manually gathering items/etc. If this combinator included an option to transmit what is needed by the current logistics network to complete blueprints, that could be used in conjunction with a building train/building tank/etc. to automatically supply only what is needed as it is needed.
How difficult would that be to add?
