It's a question of convenience. For a user it usually makes no big difference
if:
- He closes the laptop 
- He must restart the computer
- The computer restarts itself
- etc.
What makes the difference is, whether he has the documents after that incident
and weather he is bugged with questions to save the file.
(Just two examples: Web browser will not ask you to save tabs with correct
settings. They will just do it. Another well known text editor as well.)

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