I don't know how far you are in village, but that 20-30% reduction is only for the base production of them. There are later upgrades to production for a lot of materials that got hit super hard, meaning plant fiber/wood/stone production is somewhere around 10% of what it was pre patch in the later game. (each of those is boosted by two upgrades that got changed from being multiplicative with themselves to additive, and those upgrades got hit to something like 33% of their previous effectiveness at max level). My gold income took around a 38% hit. I don't remember what glass/metal/hardwood/gems were at pre patch, but those got hit pretty significantly too.
And late game (around tier 4 buildings unlocked) in village already had material storage ballooning much much much faster than material production. And buildings unlock that need those large material storages to build.