Trying to figure out if this is a waste of space/energy. Does the prod actually give you like a second reroll for a chance to produce extra asteroids? It doesnt quite feel like its happening but I really cant tell if its working for me or not.

Productivity produces the results of the recipe again when the purple bar fills up unless the recipe itself specifies otherwise. The asteroid reprocessing recipes do not include any such thing so you do get a reroll.

Is the UI lying to me then? e.g. the crusher shows my metallic asteroid reprocessing going from 1.62 -> 0.64, 0.32, 0.32 for inputs to outputs. If there was prod I think it would be a bit higher.

I realize though it can't add a full 50% cause then you could just produce infinite asteroids and most catalyst recipes usually give you a smaller prod than the full output, but it doesnt seem like it affects anything at all.

I checked the code just to be sure and it turns out you're right: the reprocessing recipes have allow_productivity = false set.

damn. well I gotta redesign again lol