Introduce separate "Use the administration theme when editing or creating users" appearance setting

Thoughts? Would already have made sense in many projects for us. Currently, elevated users have to masquerade as users who are not allowed to see the admin theme to see the user (create /) edit form like every user should see them.

Of course, typically the user create form is used by elevated users. The user edit form is especially affected by editing the elevated user's own user profile!

This definitely is a valid use case and I can see how this could be important to some sites. However, majority of the sites rely on the defaults, and for that reason we have been thinking more in line of removing this functionality altogether from core, and relying on something like https://www.drupal.org/project/theme_switcher → to do this.

Thanks @lauriii yes, I totally agree that would be the other option. Is there any issue for the removal we could link here?