Well, I get changing the base recipe for Arcane Stone to be more expensive (7x the shards for the same amount), but changing the ratio of Arcane Stone to Arcane Stone Bricks doesn't make much sense when compared to their other balancing strategies. Many other recipes retain their original in-out ratios, especially when the player upgrades their infrastructure.
For example, hoppers need a chest, 5 iron plates, and an iron gear. That gear goes away once the player has an assembler, leaving the original ratio of 1 chest + 5 iron (plates, done cheapest, 1 plate = 1 ingot) : 1 hopper.