`FileType SUMMARY` blocks until dialog is closed

// `FileType SUMMARY` blocks output until dialog is closed,
// others don't.
FileType SUMMARY
//FileType EDIT
//Prefs
//Properties
@output:after command

As far as I can see, it isn't justified for the dialog to block further execution, if other dialogs also don't do that.

Some dialogs are modal (and not just that one). That isn’t a bug.

Wikipedia says:

A modal window creates a mode that disables user interaction with the main window but keeps it visible, with the modal window as a child window in front of it. Users must interact with the modal window before they can return to the parent window.

In contrast to Dialog-based message boxes, e.g., the file type summary dialog still allows to interact with the lister. How does that relate?