It would be nice to somehow see beforehand that certain furniture doesn't unfold its full skill bonus in lower tiers. This "soft-damped to ..." text gives none information about which furniture are affected and why that is.
Additionally, I now built a Tier 4 room finally, hoping to finally not having a reduction because of materials. Still there is 9% reduction.
Hell if not even Tier 4 gives full bonus, what am I supposed to make my house of?!
Maybe give some insight about which furniture needs which tier, or just make it like in the early days: all furniture give full bonus multiplied by the room tier.