
As you can see, the highlighted in green piece is a "Direct Resource Intake Gate", resources on the belt enter the Assembling Machine without the need to go trough a robotic arm.
Benefits:
Doesn't require electricity (it takes it from the Assembling Machine) so less poles/cables clustef*ck.
Has an internal storage capacity (it is a sort of chest, in a sense) so your belt won't fill up and production will keep going with less bottlenecks
Remove some of the sillyness of having 1 billion robotic arm for everything. This item should be preferred to robotic arms for direct intakes into an Assembling Machine.
Cons:
changes in Assembly Machine production could require the player to empty the internal storage of the "Direct Resource Intake Gate"