Microsoft already has a solid foundation of great studios in the Coalition, 343, Turn 10, Playground Games, and Rare. Adding ninja Theory and Obsidian alone ensures that we'll see a higher output of quality games.
I think the question mark is how Microsoft intends to handle all these studios. Sony is giving every single one of their studios, copious amounts of support, funds, and time to complete one off, ludicrously high quality games. Microsoft seems to be taking a broader approach. Give certain studios lots of time and funds, perhaps letting some AA studios expand into AAA, while perhaps also letting some AA studios keep putting out AA games, and I think that's smart.
It might be smart for MS to put more AA games into the wild, and see if they stick, then push sequels for the ones that really hit a chord into the AAA space, or expand them into AAA like they are dong with Sea of Thieves.
Perhaps MS hasn't released as many Blockbusters this gen, but they have blown the competition away in post launch support, and with Game Pass, I can only imagine that's going to be a strength. I hope they come out all guns blazing next gen.