Thank you for the feedback.
I don’t entirely agree with you - the exact opposite of deterministic would be ‘random’, which is a word I may use to describe a Chaos Orb in Path of Exile, but I would be much less inclined to use to describe most crafting in Last Epoch. I think to leave the current answer as-is but replace ‘deterministic’ with ‘chance-based’ would result in most readers having a worse understanding of our crafting system than if they had read the current answer.
It is conceivable that someone’s first craft will be to apply an Affix Shard to an item which currently has no affixes on it. In this case there will be no fracture chance, and if they read about a chance-based system on the website, they may think they were lied to.
I’ll update this answer to include a brief mention of fracture chance so that players know crafting is not risk-free, but I’ve seen many people refer to our crafting system as deterministic and I think it’s about as accurate as a single word can hope to be.
In our next patch we’re making some changes to how the game conveys crafting-related information, which may help players understand the impact an individiual craft has on their ability to craft on that item again in future. That might help make it feel less arbitrary.