It's simple.
If 400k people wanted to try the games out on Game Pass within the past month and Sea of Thieves was one of those games, but they dropped after playing it for a few hours then number is not that great. It's good that they tried it, but it's not great.
So tell me, how can 400k people playing it for only just a few hours be considered a huge success.
If this were a "flash in the pan" situation where the game just released, it could make some sense. It's not though. We're about four months out, and the info we have shows ongoing influxes of new players month-to-month. And again, it's not a F2P game; These players reflect either a purchase, or a paid subscription.
You're constructing this premise that players
must be immediately dropping the game (without explaining your basis),
and presuming users must be heavily using free promo accounts (in a time frame where that would be unlikely),
and creating this weird standard that a sale doesn't count if
some number of players don't keep playing (which would apply to
every game). If you understand why a standalone-only purchase is different from one that can also be part of a subscription, you
should understand why your points have been received as so oddball.
If anyone calls this number anything short of a success, then they're going to be criticized. I didn't come in this thread just to post " I'm not impressed " I came in here because I've seen people attack others for not being impressed with the number.
The more labored your rationale explaining how seemingly good news must
actually be bad, the more likely it'll be criticized by others. That's how things are, and how they should be.