THAT is something I don’t get. Okay, Switch 2 cartridges are expensive, I get it. But PS5 discs? Probably dirt cheap.
Main problem with a multi-disc release could be that you play the games on disc 1, while a friend of yours plays the games on disc 2. and after some weeks, you exchange them.
But we are talking here about a collection of established games. Saving money won’t be the top priority for most buyers!