It's almost like trying to squish different security architectures on top of each other doesn't work well. It's a nice idea, but it was either not going to work smoothly or be a big security issue.
So if I'm understanding correctly they now let you type a command to open a new window to check your credentials (like polkit?) instead of asking for it in the tty? And the only new thing is that you can elevate your privileges in an existing tty (before you would need to start a separate admin terminal right?)