@roz In general, I would agree with you! I like having variety in my game developers, it means that I'm not just playing the same three games over and over again (no matter what my Steam library says). But I have to say that of all the huge takeovers/buyouts/mergers that have been going on lately (Disney comes to mind), Microsoft is the one that bothers me the least. They aren't interested in changing the path of a development company, they mostly seem to be trying to buy up broken companies that have lost all credibility with their audience and making things better.
Granted, Activision/Blizzard is a BIG buy. But given that Microsoft itself doesn't have any really BIG heavy-hitter developers already on the payroll, I would say this is more them starting to really step out onto the field. Game Pass is great, but it in and of itself does not create games, it just provides a platform through which you can cross-platform between Xbox and PC.
Now, if in a few years, there's talk of Microsoft acquiring Square Enix or Bungie or Ubisoft? Then I might start to side eye things a little more. I think this particular one will get a standard investigation, but I don't see it being some huge deal. Hell, I was more suspicious when Disney acquired Marvel, Fox, and a chunk of Sony within a span of like... 6 years.