I figured it out!? Strategy for upgrade/expansion
You often say, that you miss one special item for barn and silo or land expansion - same with me. I am always short on planks and nails - and get tons of duct and wood panels. One week ago i was lucky and bought 2 x 10 planks after i upgraded my barn - so i had nothing then the 20 planks. From this time i allways get planks from toolboxes, harvesting, etc. but no more tape...
So for the silo i get rid of all my screws and panels and - i get nails, nails nails - but no more panels/screws.
So mayby it is not supercells one and only idea to force us into diamonds - they just want us not to pile up the items?
Mayby its a good strategy - to have a balance in your barn/silo, because now i usually get all items - Same with land expansion.
Or its just a big coincidence.