[pentium166]

I agree that stacking multiple modal dialogs should generally be avoided, and if whatever you're doing is complex enough you should consider whether it needs to be in a dialog at all.

What I'm talking about is if I'm using popover to alert the user about something, let's say another user updated the page they were viewing, and they clicked into a confirmation dialog fractions of a second after the alert arrived, the alert is now behind the dialog and attempting to click on it either does nothing or closes the dialog, depending on how I've configured the dialog.

As the application developer, I'm responsible for deciding how the modes in my multi-modal application behave, and I want top-level alerts like this example to be interactable and in front of confirmation dialogs in all modes, regardless of which one opened first. With the current top layer behaviour, that is not really achievable without doing something like reparenting open alert popovers into the most recently opened dialog, and that's ALSO not properly functional (element state gets reset) until Element.moveBefore() is generally available.