Interesting..
The thing about teams is that many of them will be given their own assigned budget or task assignment. Aside from this simple fact, teams are equally as interdependent on each other for resources and assets. Battle designers will still rely on environmental artist, similarly battle designers may also heavily rely on level designers or asset design. Equally scenario designers will also rely on a myriad of teams including battle designers and environmental artists. So yes it is still a perfectly logical thing to expect. Is it great? Nah. Is it ideal? Obviously not, but in the end it is still a valid point.
I only half and half agree with the point regarding content. We haven't really had less content. It has been more sparsely designed. But more importantly the issue is surrounding the level of replayability it has with the community. Deep dungeon wasn't exactly a monumental amount of content, versus the simple fact it was an extraordinarily designed piece of content for replayability. This is as much to do with incentivisation as to what it does with anything else. Placing the levelling and relics within the same set of content was a massive let-down in this regard. So yeah, I would argue we have as much if not more content but it hasn't necessarily translated into said content having the same replay value - Which the replayability is the bigger issue.
On the comment of testing. Having the time to test something, and then having the time to pass all those results through their pipeline to eventually feed back to the job and encounter designers, and then having them make the necessary adjustments are 2 entirely different things. Which given how much design actually goes into an expansion it isn't really the most feasible thing in the world to expect balanced jobs from the outlet. I suppose on this regard the only comment that can be made is to wait and see what changes are coming in 6.08.
What one person can construe as being lazy, another can reasonably construe as just having tight deadlines and not having the ability to meet every nuance of them on the expansion launch. Hence the reason for minor patches like 4.06 or 6.08.