Enevhar Aldarion
Oh Wise One
In general I approve of KISS solutions. I agree that the 10 shard limit is annoying at best. In this case, though, I would suggest that the limit scale with chapter. Start out with 10, and then increase by two every chapter. It's a small gain, but would add a continuing value for the players in the higher chapters.
I am in chapter 20 an now way Inno will ever give me storage space for 28-30 broken shards, when they keep refusing to increase it from 10 to 20, as has been requested many times over the years. Considering the half-assed way Inno "fixes" things with the most recent Wonders added to the game, I would not be shocked if a chapter 21 Wonder would allow storage of extra broken shards.