While you might convince me that a warehouse is a source of red black and green mana, you will struggle to convince me it is a literal swamp mountain forest.

Sadly, I think we're long past the point where basic land types have any connection to the flavor of a card. Valakut, the Molten Pinnacle isn't a mountain, but Steam Vents are? Similarly for legendary lands. It's purely a mechanical distinction at this point.