Extreme dogmatic positions tend to push people to the opposite pole ... at least in the arguments they make if not their actual thoughts. I think that's just kind of basic psychology. Internet forums don't tend to attract participation from people who are generally moderate. I don't see a lot of posting that would be consistent with the idea that the WoW team is genuinely passionate and talented but quite a few of their core ideas for this expansion just missed the mark. To say "BfA is disappointing to this point but let's not shit on the people trying to make content that we would enjoy" would be a perspective we don't really see here.
I'm pretty sure I could find about 1,000 examples just from today where people have posted utter nonsense about how Blizzard's intentions are evil or their competence is nonexistent or other similar rubbish. I do think there are some who work too hard to counter these ideas but I do not generally interpret those posts as much "Blizzard can do no wrong" as I do "that's not a fair criticism".
You're really doing the same thing I'm talking about right here. I highly doubt you know anyone on the WoW team to be able to say they have "zero passion for their projects" and I think it is a logically absurd position. It's a company that wants to make money and they have a valuable property that only stays valuable with continued success, why the hell would they hire people who don't give a shit? That makes no sense. In any case, I do know people on the WoW team and I can say with great confidence that you're completely wrong. Despite what armchair developers think, it is quite possible to be fully invested in your work and deliver something that just doesn't pan out.