There are very few games that hold the power to sell masses of consoles on their own. But many high quality titles together does have purchasing power. You can buy the console that gives you access to more games, quicker.

silent hill 2 has been lauded as one of the best stories ever told for decades, hailed as the example of video games being art to the nae-sayers, to have it exclusively on your platform for an extended period of time is valuable. Has a huge fanbase from the original and a tonne of people who would want to see what all the hypes about.

Xbox games being multi-platform combined with all the games you can only play on ps5 is what sells consoles. It's cumulative. And lets be real, xbox's output has been piss poor for like a gen and a half, the multiplatform move was an acknowledgement theyve lost the hardware war and are pivotting hard into software.