>GOS lulls users into complacency by focusing on the security angle only and encouraging users to install sandboxed GApps: https://grapheneos.org/usage#sandboxed-google-play

Sandboxed-Google-Play is not encouraged or promoted. It is suggested if you need apps only accessible via Google Play or needing Google services purely because it provides the maximum compatibility. GrapheneOS have always said that Android's strnegth is a large wealth of open source apps (many of which do not need Google). If more everyday apps (media streaming, taxi, food delivery & rewards, banking, government, social media) did not depend on Google, GrapheneOS would not spend the time, resources and effort that they have on sandboxed-google-play.