K8y it just has a list of about 10 apps, like Google Play, PDF, and Vanadium.... Is that it?
Indeed the list of apps officially shipped by the GrapheneOS project is currently short. That said, one of them is Accrescent, which itself is an app store.
In general it is difficult to ship high-quality, privacy-respecting apps and to ship a large number of apps. So far the GrapheneOS project is focusing on quality over quantity.