I don't know how it was in the basic version of Krastorio before, but shouldn't the “superior inserter” send items further into assembly with an incomplete arm after a while, as the “bulk inserter” does? Because when working with different items on the same line, it gets stuck if you don't configure each of them individually (reduce the maximum number of items it should take in its hand), and then it becomes not very convenient.
(I understand that while it used to be an improvement on the standard inserter, it is now an improvement on the batch inserter, and it now functions in this way due to its properties.)