Think of what you acquire when you acquire a company. You acquire intellectual property - products & ideas, you acquire people - future ideas, you acquire customer base - players. If you behead the company you certainly will lose critical people with it risking the products and customer base too. This isn’t Microsoft’s first acquisition, they’ll manage realignment of the new organization differently than just wholesale ejections. I’m sure Bobby’s new schedule has time for rest while he vests.
The video game development industry has a lot of financial similarities to pharmaceutical development.
As a major, why should I take the (large) risk to develop novel product? When I can outsource that function to a large number of smaller companies, who either go bankrupt or produce something of value, which I can then afford to pay a premium to acquire, after its value is known? I.e. if I can substitute money for risk, why wouldn't I?