The material design spec for full-screen dialogs says the following about full-screen dialogs:
Mobile only: Due to limited real estate on mobile devices, dialog content appearing in other form factors (tablet, desktop, etc.) may be more appropriate on mobile using a full-screen dialog.
Looking through examples, it seems that full-screen dialogs are mostly used for forms. But if full-screen dialogs are only for use on mobile, and I want my interface to be responsive, how would that content translate to a desktop screen?