Well it that's the case why haven't those questions been asked?
It's because most bands, like actors and athletes won't give a interviewer a second chance for an interview if they piss them off. Only the well established get to ask the real tough questions.
I'm not sure what you mean. Are you asking why a lot of these journalists don't ask new questions? Frankly, I think it's because they're lazy. They look at the latest news about the band, "New Drummer" "Grammy Nomination" "Self Title Album" and they ask the simple, generic questions relating to those subjects, instead of bothering to do their research and find out how many other people asked them before. And frankly, I think that's just lazy journalism on their part.
I understand what you're saying about tough questions, but the questions don't have to be tough, necessarily. I'm not expecting them to ask, "So, there are fans that are saying that your albums sound awful and the production is horrible. What do you think about that?"
But it is possible to ask more creative and interesting questions. Heck, personally, if I was one of these musicians, I'd get pissed off BECAUSE of these lazy questions and because I'd have to answer them a million times instead of talking about something more interesting and letting other people know something new.
The thing that I find interesting about the current interview is that the questions WERE more elaborate. It wasn't just, "So, why did you pick Mangini?" The question was much more elaborate than that, and so was the answer, and I think the reason why it worked better was because she pretty much admitted right off the bat that JLB was her favorite vocalist, so he already knew that she had to know a thing or two about the band and he could elaborate on his answers a bit. For example, I personally didn't know that they had a plan B if NONE of the 7 chosen drummers had worked out.