We suggested this once upon a time in the beta forums I recall, the reply was along the lines of UI memory limitations due to PS3, albeit they used to use that for many requests as an answer.
From Misteq or however you say her names recent interview, seems they are continuing the whole "We are limited" asnwers, along with "we have only so many people".
Honestly these days I wouldn't mind a slower patch cycle for better content/QoL which is different to previous expansions structure.
