I'm not sure why you're asking here, but I'll just quote what I wrote on the EN forum when someone asked the same thing:How come we got this great features on workshops that lets us reset them all at once but we didn't get that feature on manus? I think this is an awesome feature that should be added to other buildings.
I think it is due to two reasons:
1) The cost - how to handle things if you have enough resources for some of your manufactories, but not all?
2) Once a manufactory reaches level 24+ the production options change. Instead of four different options for standard goods you get two options for standard goods and two for sentient goods. What was previously a 1-day production becomes a 3-hour sentient production, and the previous 2-day production becomes a 9-hour sentient production. Add to that the fact that your sentient boost is different from your regular boost and it becomes a mess