As Economizer has added to his most recent post, there was in fact a post in regards to magic skill caps on the Japanese forums. The below is the official translation:

There are caps placed on the amount abilities/magic effects are increased due to skill values.

There are two meanings to this:
  • In order to achieve balance at level 99, it’s necessary to establish a cap somewhere
  • Set up some leeway to be able to have creativity/trial-and-error for enhancing other parameters and having a choice of equipment
Similar to how we raised the caps on traits from level 75 and up, we will be making continuous adjustments and it’s not like we won’t be raising the caps in the future. However, in the meantime, based on the current cap when reaching level 99, we would like to get a wide variety of feedback.

When giving feedback, please have discussions separating them into elements such as the below:
  • How to consider the cap itself in the future
  • Exploration of other growth methods once the cap is reached
  • Ideas and concepts of abilities/equipment with caps