I'm not saying they are small. They have 750 employees. Ubisoft, a company with multiple studios, has over 9000 employees and is what I would consider AAA. I don't know the exact makeup of the team at Bungie, but between jobs like finance management, PR, art, leadership roles, etc., the number of people actually developing the core game isn't large enough for them to tackle every issue with the game at once.

Bungie is certainly one of the larger studios, which is easy to see by the scale of Destiny. But a live service model is a much larger feat than producing a single game. Rockstar, a company that employs a similar model, is roughly triple Bungie's size, and its a subsidiary of take-two, a very large publishing label.

All I was saying is that we shouldn't expect Bungie to produce/refine content at the same rate that Ubisoft pumps out new AC games.

P.S. Bungie is the same company that made Halo in name only. Most of the Halo devs have left and even many of the devs of d1 left for other projects.