They’re trying to soften the blow by adding new features to each tier, but it’s still just to disguise a price hike. More games are coming to the $15 tier, but it still won’t be day and date releases. First party games come to the $15 tier “within a year”, but that’s even excluding Call of Duty.
Even if you play every day one release, there’s hardly one of those per month. The math used to work out, for a long time, that one month of Game Pass was about 1/4 of the cost of a full priced new release, so going for a subscription made some kind of sense for a certain kind of consumer. This is a hard sell.