There has already been a lot of discussion on the move towards game key cards, and I'd like to talk a bit more about the cost aspects.
As games get larger it seems natural enough that Nintendo is pushing for faster storage technologies to reduce load times (e.g. MicroSD Express for external storage, faster game cards).
By now, most of us have seen how expensive MicroSD Express cards are versus their slower counterparts. To avoid game card loading times being majorly worse (they are still somewhat worse it appears [1]) than digitally installed games, the new Switch 2 game cards are also faster and - which should surprise no one - more expensive, presumably costing developers around $16 each