so is main benefit of warehouses more trucks?
I don't see why making consumption and production add up exactly is important. If consumption is a bit higher - then all production will go to factories and the rest will be imported. If production is a bit higher - than consumption will all be from internal source and the rest will be exported. I don't see why warehouses are needed in this.
But IF there are not enough trucks to make it work, and warehouses is the only way to get more trucks, then I see why we need warehouses - but this is backwards. We should rather have a feature to have more trucks from producers and consumers.
warehouses add more trucks, buffer space and the ability to store somehwere outside your industrial parks
the outside storage is currently working less then optimal, due to consumers ordering from ANY wahrehouse, not just the closest, the more trucks and buffer space is left
consumers curently can store ~14t of resources for unique industrys and up to ~21t for processor buildings which seem to last ~3-4 weeks
producers and consumers store varying amounts of products(between ~14 and 64 depending on type) while warehouses store severeal hundred and producers seem to export when they reach ~75% full, and filling the next truck will only take a week or two, meanwhile driving to the edge can take like 10 weeks or more without traffic, wich leaves only a small window of opertunity to order and get the resources localy, even with mostly balanced setups
since the edge to export to is random you cant build close enough to the edge, wich means your producers will fill up with products but all trucks may be used for export already or your consumers are importing while your producers are exporting the very same resource for even more traffic, since no trucks will be available
and no trains/ships/planes wont help much as the new delivery trucks seem to avoid those often in favor of roads
so warehouses allow you to buffer some resources and increase the amount of trucks so that some trucks are always idle
its mostly for the trucks though and the fact that the amount of resources needed is set on a per building base, and is not displayed in game outside the asset editor
and while small amounts of import are possible for raw resources, it does not work for intermediate products like plastics, which cant be impoorted, but generate the important revenue from unique industrys