Here are some examples of having to expand a building as opposed to just adding another small, to be able to make the "things" which _are_ or _will be_ important to make to make "the really cool stuff"....
Foundry
The ore delivered by mines is used in the foundry to process the copper, bronze, steel and cobalt that serves as the basis for producing powerful weapons and equipment.
small: Copper, Bronze, Steel
middle: Copper, Bronze, Steel, Cobalt
large: Copper, Bronze, Steel, Cobalt
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Stonemason
small: Statue
middle: Statue, Jug
large: Statue, Jug, Stone plaque
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Engineer
small: Weapons-grade steel, gears, batteries, ball bearings
middle: Weapons-grade steel, gears, batteries, ball bearings, hydraulic pumps, chips
large: Weapons-grade steel, gears, batteries, ball bearings, hydraulic pumps, chips, motors, AI system\
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ANd the Armorsmith, Temple, and ARmorer's Workshop, all have cool stuff the bigger you build...
I know that the Engineer one is going to be important to get through the QUests, and build stuff for the MECH.
Yess. having 4 wells and 2 wooddcutter's hut has seemed to improve my basic ability to create raw materials.
GYNDE