Lack of content on patch release
For me this latest initial patch has been the most lacklustre patch to date. (not including patch 4.3x) After farming the new trial, getting the weekly drop from the new 24-man raid and doing what feels like the exact same Namazu quest 3 times per day there isn't much left to do within the patch.
I had high hopes for a new frontline as the last frontline we had was Shatter, which was released 2 years ago.
Feels like most of the content of this patch won't be released for a while until eureka and deep dungeon eventually come out which seemingly could be anywhere from 2 weeks time and 2 months time.