Serious question, why wasn't the cap for Tomes of Creation increased from 450 to 900 with 4.8?

It feels like 450 is way too small and makes gearing a spec (much less 2+) take forever. Seeing as they nerfed the cost of the Prototype Tomestone from 7 Crystaloids to 4 I'm surprised to see the capped tome's got ignored completely.