the developer needs to write code to detect the current profile. Most app’s don’t do this, and they explicitly ask a 2nd time. Not apple’s fault.

There are some apps that get this right. Infuse recently added support for this.

It's not the end user's problem whose fault it is.

I agree with you.

and the end user can blame Netflix, Prime Video, Disney+, YouTube, etc for not delivering the best experience for their customers. ¯\_(ツ)_/¯

I don’t know I think Apple should be able to keep COW filesystems for every user to apply atop a read only file system. Unique apps, unique settings (maybe unify tv settings into admin panel) and no cross-contamination or need for app owners to switch profiles. macOS software doesn’t need explicit understanding of profile switching, neither should iPadOS software.