Why does ernest hemingway use vague pronouns and simple language in his writings?

Ernest Hemingway uses vague pronouns and simple language in his writings to reflect the reality of the character's situation in a straight forward manner. He realizes that life is simple - you either do this or that, and there shouldn't be much mulling about it. He wants to convey such messages through his writing, to write about his ideas in a simple, yet highly meditative way.