Because history has shown that they are quite useless. They were doing well at the beginning with Xbox 360 and in the middle of the generation they focus on kinect leaving their customers aside with only the trio Halo, Forza, Fable.
With Xbox One a total disaster and when it seems that they are improving they announce that all their exclusive ones will leave on PC, losing interest for all those who had a good computer.
When it seems that with Xbox SX they start better they announce that they will not have exclusive games for another 2 years. The PS5 exclusive will take advantage of PS5 and will be created based on it, the difference will be important, so the Halo Infinite trailer did not impress anyone.
Microsoft has proven to be a company with a lot of money that makes bad decisions and none of that has changed.