Good writers strive for originality, and they seldom use idioms taught by our high school English teachers.
Composition writing, for many students, involves rote learning. Because most teachers themselves were students of rote teaching, there has always been a preconceived notion of learning idioms by heart. Many idioms, with time, has become a formula for writing essays.
The difference between the use of cliché and creative writing, of course, is best appreciated by reading works by good writers. One of the novels I have recently finished reading is Percival Everett's Erasure. The novel tells the story of Thelonious Ellison, a black novelist who is not black enough; he graduated summa cum laude from Harvard. He is good at mathematics but no good at playing basketball. He is drowned in a family and identity crisis. His father was dead for several years. His sister was recently murdered by anti-abortionist. His mother was slipping away on her kite of senility or dementia. He could hardly get a job at the English Department, let alone having his new book published.
To explain his tough situation, he wouldn't use the cliché that he was the captain of a sinking ship, that implying some kind of authority, but rather he was a diesel mechanic on a steamship, an obstetrician in a monastery.
Admit it, the last two sentences are better than any idioms we've ever learned.