"It does not take into
account a single recipe being affected by multiple technologies"

About that. Do you know where could I find info about what tech affect what?
I can't figure out my different weapons bonuses.
Same with inserter capacity and belt capacity (I learned yesterday that the later was a thing)

Thanks, sorry for the offtopic

Technology prototypes have an effects property that contains a list of effects the technology has. There are various possible types of effect a technology can have including change-recipe-productivity, ammo-damage, inserter-stack-size-bonus, and belt-stack-size-bonus, among many others. Each type of effect can then has its own further properties that can make them more specific.