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They also mentioned not wanting to get into a rotting zombie of quality. And future plans. But Steel hit a lot of the big ones, but I think Buu was also Kaiser being Kaiser, or Taka, I get them mixed up. Either way, whoever’s the de facto head of TFS basically ended the ride.
Yeah, that's the official story, but I still have my suspicions about the "not wanting it to become a zombie" explanation, as they did mention quite often in streams and let's plays, right up to the point of cancellation, that they had plans for Buu, I think Lani even mentioned being excited for it. Plus, they only had one saga left, it's not like it was going to end up like The Simpsons or Scrub's where it just keeps getting renewed year after year despite the constantly dropping quality, they had a finish line.
Personally, I think that part of the group was all in on it, part of them wanted to end it, and some of the group were a mix of wanting to finish it up and tired of dealing with all the legal B.S and they couldn't do Buu without the people who were calling it quits help, so they made burn out the official story. Which is technically true, a few people were probably feeling a bit burn out on DBZA, and it's not like they're going to throw anyone under the bus by saying "Yeah, we wanted to do Buu, but X and X didn't want to, so we're calling it quits" (at least, not yet, a few years from now, who knows?).
I still think they should have announced they we're going to do a couple month hiatus to compose themselves, rest, recharge, maybe sort out the bullshit, and then finish up DBZA, maybe even make Buu a bit shorter then Cell so as to avoid burn out again. I know this is certainly not the source of all of modern TFS's problems, but I do think calling it quits hurt their image and started imposing a mind-set on them that is not doing them any favors.