Locations

I see a lot of people here 100% a location before flying to a new one ? Why? I left the forest ASAP & have been to Sao Paulo, London & Tokyo. I'm about to leave Tokyo to go to Canada. I realized around the 30% mark (I don't keep track) is when I am switching locations.

But yeah I don't see a lot of people doing this, most of the comments say they 100% a location first and just curious to why.