Mixing plant is annoying..

Before I start, if you have a profane nickname & are going to leave profane comments, don't bother commenting. I'll report you.. 3 raw material factories with 4 ingredients.. 4 baking factories with 5 ingredients.. Up to this point, changing ingredients is manageable.. 4 mixing plants with 6 ingredients.. On top of that, the production speed is different for each ingredient.. Mixing plants are more bothersome because making donuts is complicated..