Hear me out.
Scientific progress is one of the driving themes of Stellaris. Whereas once a fleet of 10 Corvettes armed with simple mass drivers was a significant force, two centuries later packs of thunder-throwing battleships roam the stars, led by even more massive Titans. A civilization that saw every single outpost as a significant resource investment now casually encases an entire star in a metallic shell.
But you know what apparently always stays the same? The way metallurgists turn minerals into alloys. 6 units go in, 1 unit comes out. More "advanced" buildings only give you more slots, not more efficient processes. And while it is funny to imagine a genetically perfected, immortal being forging the iron with the same hammer his great-grandfather had used for the same purpose; themetically it just makes no sense. If the power of science allows us to pull minerals out of a black hole, why doesn't the same science open a portal to the Elemental Demiplane of Alloys?
Or to put it into Victoria 2 terms: Where are my factory input, throughput and output modifiers?