Edit: You've edited your response so many times I can't keep up. I am not arguing any point of view. You unilaterally said that it is always a bad sign when a company brings in an experienced CEO. That is an ignorant stereotype. Sometimes they succeed, sometimes they fail. Sometimes it's a smart hire, sometimes it's not. The late Dave Goldberg taking the reigns at SurveyMonkey was an incredible turning point for the company.
I feel "professional" managers are bad for tech companies. Here are two reasons :
1. A lot of management techniques that are taught in business schools apply to traditional manufacturing based businesses. A lot of these underlying assumptions are invalid in the tech businesses.
2. Tech businesses require a deep understanding of what is possible with the current state of the art. This is requires a deep understanding of technology so that when there are fundamental changes to the landscape (which happens more frequently in tech) the company can adapt and stay relevant.