I actually think this is the wrong diagnosis of this situation. The studios in Microsoft gaming appear to have been given a lot of room to take risks under previous leadership, build passion projects, etc. while letting big franchises sit on the side. Those things ended up being anywhere from abject failures to small successes - where some players and critics loved them - but most don't seem to be commercial successes.
In the meantime we haven't seen a new Quake, Fallout, Elder Scrolls, Perfect Dark, Fable, Banjo, Conker, or the myriad of other mainstream IP they owned in decades. Most of these franchises have lost a ton of value after sitting on the shelf for so long without releases.
The thing is, every time you take a swing on one of those big IPs, you take a risk.
Sure, you can do well: Skyrim was a big step up from Oblivion, for example. But you can also screw things up (see: Halo), or fall into the trap that Valve has fallen into with Half-Life 3 where the expectations of the public can never be truly met.
I think what they want to do is make the next WoW. Low-risk, customer lock-in, people identifying themselves with their consumption of the IP to an almost ludicrous degree. You see that already in some ways with Fallout 76.