You missed the point. In modern times it's expected that you'll travel those 300 miles. In the mid 1700s, no average person would be expected to make that journey
JS Bach is one famous example of a person who walked hundreds of miles all over Europe to visit people and find work. There were many other (non-famous) people who did the same. Lots of travelling merchants, for example. They may have had draught animals to carry their wares or pull wagons full of goods but they often did the walking on their own feet to move themselves.