The merger of two large entities in the same market is a pretty clear example of something that should raise antitrust concerns.
It did raise concerns and it was reviewed by multiple bodies around the world, with many concessions made. Do you believe every single review body got it wrong on the facts?
Why? Two large corporations merging isn’t in itself antitrust. In some cases an industry is in decline and it makes a lot of sense for large companies to merge otherwise both might go out of business (clearly not what’s going on here, but just an example).
I disagree because Microsoft doesn't hold some unique barrier to entry into video game production the way they do an operating system.
You can argue that this specific case doesn't rise to the level that would actually result in anti-competitive results. My point was just that the merger of two large companies is the kind of thing that deserves scrutiny, because your comment implied that it couldn't even in theory have antitrust concerns.