I think it's fine for the "sinking in a lake" case too? The water pressure prevents the door from opening, and my understanding was you want the car to fill with water fast enough you can take a breath, let the pressure equalize, then open the door. You're likely not going to get out through a broken window while the water is pouring in through it (I guess if you're fast enough to still be above the water line), so by the time that stops it doesn't seem like there'd be much difference between opening the door and maneuvering through the much smaller window.

https://www.youtube.com/watch?v=VC68mflUEwc