What is the major premise behind the linguistic relativity hypothesis?

The linguistic relativity hypothesis, commonly known as the Sapir-Whorf hypothesis, is predicated on the idea that a person's native language strongly influences or determines the way they see and understand the world. While this theory is compelling for many people, and has been the premise for a number of works of fiction including the film and short story Arrival, it is no longer accepted by the vast majority of linguists. Taken to its logical extremes, the Sapir-Whorf hypothesis argues that Chinese speakers cannot understand linear time; that Russian speakers see more shades of blue than English speakers; and that Yimithirr speakers always know which direction they are facing under any possible circumstances.