That's the thing -- for a while they had figured out gaming. The xbox and 360 were solid consoles with lots of great internal and external games. Halo was incredible.
Then the company did the thing that Amazon did, Blizzard is doing, and all the big tech companies do -- they thought their big war chest meant they should make bigger games. Budgets ballooned, game timelines extended. Now they are stuck with games and studios with 10 year dev cycles trying to create the biggest, the most incredible, the most expensive games.
There's SO many devs out there making incredible games for fractions of the cost. It's a shame Microsoft (and others) keep thinking that reaching for bigger means better outcomes. No one wants "the game only Microsoft can make", everyone wants another great Zelda. Or Gears of War. Or Satisfactory. Or Mina the Hollower. Or UFO 50. Or Animal Well.
Hell, people want a game about shelving 3000 books in an Arcane library. Let games be smaller, more exploratory, more creative experiences. Let your studios get weird with it. Let them explore spaces and take risks. Stop sinking tens of billions into games. Start sinking tens of millions into them.