If the stone bricks were to generate moss overt time it does two things. First, it gives people who like the pristine look a reason to re-visit their old buildings as a level of up-keep. Second, it makes people who don't think they're good at building, like me, natural charm over time.
For people who like to build really tall buildings, either make it only generate near the base of a structure or just remind them scaffold exists.
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