So here are two screenshots that show what I mean:
In both of these examples, I’ve created either a supply stockpile or a mini supply stockpile in order to have a bit of a local buffer so that I the resource importer won’t get overloaded but as you can see, the stations still “complain” about insufficient resource despite the nearby (mini) supply stockpile.
You can see (I think) that there’s also a queue of cars lining up in preceeding operations/stations so it will need those resources. Instead of waiting until the car gets there and it figures out that ti doesn’t have what it needs, it would be nice if the predictive stock control was vastly more intelligent than that.
And you can see that in the other picture, it doesn’t really matter how many supply stockpiles I have, nor whether they are mini supply stockpiles or the big ones, it still isn’t “smart” enough to know that there’s some nearby (sometimes) or that it waits too long before fetching the resources that it needs.
This is a critical barrier to my being able to obtain peak/optimal operating efficiency and this is especially true later on in the game when you have more options and features researched that you CAN’T produce locally. (SatNav and premium speakers are excellent examples of that.)