You can also observe this in games like Dyson Sphere Program, (which is all workers and queues and buffers) where adding a buffer storage section of a belt only hides the fact that you are under-producing one of the components required.

The buffer smooths out bursty flow but you don't want that in the middle of the pipeline, as it actually represents mid-pipeline inefficiency. You should actually be fixing the upstream or downstream problem.

[1] or other automation games like Factorio, Mindustry