Is the problem of outside MBAs their lack of deep understanding? Others here have argued that the promotion of outsiders erodes loyalty and passion of the workforce towards their jobs.

I could imagine good outsiders who have the skills for long-term big bets are quite common. But then the erosion of the community inside the company could still foil such bets.

As an aside, this alternative narrative seems more palatable to MBAs then your version. Hence it might be more easily accepted.