They can mark or damage a surface that needs its specified cleaning method. A stubborn deposit does not justify using a sharper or harder tool.
What the observation means
Door glass may also have coatings or printed areas that differ from a plain glass dish. Scraping advice for a ceramic hob is not automatically suitable for an oven door. Work only under the cool, safe conditions described in the manual.
A useful next step
Use the approved cleaner and allow it the stated time rather than increasing force. If there is a crack, chip or other damage, stop using the oven and arrange assessment. Do not hide it with a film or adhesive repair.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.