How I would change industry zoning

None of the industry buildings between 2x2 and 8x8 tile should have an ugly chimney or be a superpolluter. Now that you can put them closer and mix them into residential zones as well this would be especially nice. Big industrial buildings would appear only on much bigger zone sizes like 15x15/20x20 or even more so whenever a factory building appears with a huge chimney you have to pay attention to zoning and where you put it. Also make them more polluting so it's harder to mix them into residential zones. Anything smaller than that would be easy to mix into residential zone without too much pollution and would feel much more natural as well. Also why huge signature factory and energy buildings only employ 20-25 people? It's laughable. There are hundreds of people working in these places at minimum. What do you think?