It's a small indie company, please understand. /s


Seriously, though, it's also in their responsability to not bite off more than they can chew. I'd rather have a polished, complete xpac than one riddled with problems and weird choices, even if it meant waiting more time.
Yes, at the moment it's all cutting corners in cosmetic (which, honestly, are very important for people in MMOs. There's a good reason Mogstation makes that amount of money) but it's already not a very good indicative of what is to come. Imo, it's the small details that shows the directions they are taking.