Professional people are the most common source of unprofessional behavior.
People too confident in the security of their jobs or who think they are too qualified to act like idiots are always going to be the most incompetent, blundering people in any business.
Respected people in the Japanese games industry have noted before that people, especially managers and executives, in large Japanese development houses act increasingly more like lazy salarymen and less like motivated developers. If people can get away with acting stupid, they can be counted upon to always act stupid.
Looking at the horrendous, dysfunctional output that has come out of SE in recent years, saying that behavior sounds unprofessional as an argument of why it's unlikely to be true of SE is not a very convincing point.
Final Fantasy XIV, a flagship title from SE, was resoundingly unprofessional. It showed clear and obvious signs of slapdash development and dysfunctional management. Over the years its' predecessor had been carefully improved upon and given a variety of features as the studio learned what worked and what didn't about its' original design. A sequel comes out and a variety of these carefully-learned design facets are not only undone but actually turned on their heads or applied in reverse ("okay these improvements worked really well, players really liked that. Avoid it at all costs, do the opposite"), in an obvious instance of not caring or not knowing how to build upon an existing design with new content.
SE is unprofessional, and is the poster-child for what has been going wrong in large Japanese game developers today. That is why people can believe they behaved so incompetently. Salarymen cannot be counted on to do anything but show up to work and pretend to be busy. They aren't professionals.
