As usual, after anything Relic does all I can do is scratch my head. WTF were you thinking?
TIMELINE
1) Put game out way too early.
2) Slowly fix things, add content, and work balance.
3) Stream how important balance is and commit to keep working it.
4) Put out a limp DLC that destroys balance and angers players with its lack of content. But finally brings the casual user experience to a decent level.
So what is the end game with having all these unused assets? To make another DLC later? Will there be anyone left to purchase it after angering everyone with the missteps so far?
My guess for Relics issues is two possibilities:
1) They cant execute their ideas. Each update has had such a small amount of content. They are either working on other things or don't have the right people to get the job done.
2) They think anyone who is going to buy has already done so. Slowly trickle out DLC and hope to get small amounts of money from new players. Old players will get excited and bite also. Look how much attention this patch got already.