That whole narrative is a joke when it comes to gaming though. Game software development isn't a field with an unimaginable entry cost or where any existing IP has that much power or is even guaranteed any specific level of success. New studios pop up every day as do new IPs. Some of the biggest hits in gaming over the last couple decades have been brand new IPs.
OK, sure, Sony can do that (as if they haven't already). Tell me this: why didn't or couldn't Microsoft do that? If it is as easy as you say. Why did they need to get two publishers with IP and talent? Why is this option not on the table for Microsoft in your assessment of the situation?
Sure, getting A&B may not immediately change MS's position in the market as most of you like to argue, and they will still be "third" as you all like to highlight, but no one is expecting for that to be the case immediately after it completes. That's just silly. If anything happens, it will happen over a course of time; how they handle ownership and the moves they make after getting it — what it will ALLOW them to do, could result in a situation where it might not be good. Of course the opposite can also be true. We just don't know.
MS isn't doing hostile takeovers or corporate espionage here, they are just buying what is available for sale. Just like Netflix, Hulu, and all the media subscription services, MS needed to build a machine for in-house content, they have just chosen to do that primarily via acquisition (it's the quickest method and they can afford it). Even if they took every IP they purchased exclusive, they would still hold only a small piece of what is out there (but we know that isn't happening with CoD as there will be stipulation that it doesn't - which MS clearly hasn't cared about since the day the deal was announced).
These are not "small" moves made by Microsoft. It is a big play, and according to most of you, only they are the ones who can make a move like it, at least among the players in the gaming market, and the "small piece" that they hold won't stay small if it has adverse effects on their competition.
The only point I agree with you on is, that is this is the quickest method for them, and they can afford it, to fund creation of a content machine, which will feed their Game Pass sub.