Why is spell check not completely reliable as an editor? Spell check is just another way to avoid using a dictionary.
Spell check also points out words that are misspelled on purpose,
Spell check won't catch the wrong version of a word.
Spell check sometimes provides the wrong spelling of a word.

Tobias wolff most likely named his short story "mortals" because the story explores the theme of people coming to terms with the idea that one day they too will die. wanting to find out what their loved ones really think of them. achieving immortalit by being "big people" while they are alive. hoping that they will have accomplished something before they die.