TYPO3 Core

The TYPO3 backend login offers an interface selector where an authenticating user may select where to get redirected after successful authentication.
The default configuration is "backend", leading to an automatic redirect to the TYPO3 backend.

The configuration can be changed to allow a redirect to the frontend, which is conceptually broken as soon as a TYPO3 installation has multiple page trees, it's not determinable to which frontend the user should get redirected.

Due to this, and the fact no available frontend editing extension relies on this feature, the interface selector and the redirect handling will be dropped.