K2 has a pretty stange feature: ability to upcycle inserters (with the help of crusher). It made some, even if not too much, sense before - I guess the idea that some parts could be reused. But it never required much automation, because it was simply a QoL feature for the base upgrade. And the amount of low-tech inserters is limited at all times anyways.
Now, after integration with SA, it makes much less sense. If one wants to recycle inserters - there is fulgora tech.
Apart from that these recipes leak into the asteroid crusher, which is not nice.