It's easy to pump up monthly active player numbers when a game is free or tied to a subscription service. Just look at Poke'mon Go, with its 1 billion downloads. Now, does that suddenly mean that Poke'mon Go is the best Poke'mon game? Hell no! In fact, Poke'mon Go is a barebones shell of the original games. You'd have a hard time finding anybody listing Poke'mon Go as their favorite Poke'mon game.
Also, keep in mind that how long people play a game is in no way tied to its greatness. A game can sell 10+ million copies and be just a 10 hour single player game. Using monthly active player lists you'd think a game like that isn't very good. On the flipside a game that is manipulative, grindy, and addictive can have a massive playerbase despite being an awful game. All fun games are addictive, but not all addictive games are fun.
What MS really needs to do is man up, release actual sales numbers, and then project how many sales were lost to Gamepass. That would be more honest than what they are doing now. I get it. Gamepass costs them sales. But we are all smart people here. We can all see that if a game sold 7 million copies, lifetime, while launching day 1 on Gamepass, then that is a really damned good sales figure.
On topic, companies releasing numbers for their games isn’t required on a quarterly statement. It’s better off being told to us via tweets. It’s for gamers who are invested, not for investors.
Like the fiscal quarter that covered August MS said that 1st party was driving a lot of engagement and revenue. That’s covering the 4 games Tell Me Why, Flight Sim, Wasteland 3, and Battletoads. That’s all we really need to know. The stats that Flight Sim sold over 1 million on Steam and played by total 2 million players is a nice bonus.
But regardless it’s no longer a good metric to list sold when you pushing GP. Seems your criteria is solely meant for PS fans to dissect and use as ammo against Xbox fans online. To MS, they don’t care about “losing sales to Game Pass” they care that you play their games as much as possible. The revenue comes in other ways rather then just upfront like you are used to.
Yet they still don't report any profits or losses for their gaming division, there's a reason for that.