You're wrong. There is strategy involved and is tied to the question:
"Which shard should I make next to level my crafting?"
Make the low percentage shard with more xp or make the high percentage shard with less xp?
There used to be another factor: Make the shard with higher percentage because I have more of that essence and less of the other?
Usually the strategy was "1. Use large piles of essences before small piles. 2. Make the shards with the lowest chance of success. 3. Don't make the same shard for more than 1 crafting level."