[2020] Help me to understand

I've seen it suggested a few times that perhaps we need to add scrap costs to each crafting session for something like the AK. The logic here is ostensibly that groups only have to pay the cost once and then can craft a tonne of AKs which is 'unfair'

Is this not why we have rifle bodies and springs? if you want 5 AK's you have to find 5 rifle bodies + 20 springs in addition to having the object researched. Each session needs specific components to craft, What difference would it make to have scrap involved in these crafting sessions? is this not the same thing? Are these people just asking for AK's to be more expensive? I don't get it.

Help me to understand, Thanks guys