I downshift because I like like to drive windy roads I don't go balls out fully comitted into blind corners or anything, I stay in my lane jsut a good pace nothing crazy. Its my therapy when things are going bad or i need a break i go driving. Yes i could drive so that i don't need to downshift but then i might as well not have a sporty car at all also my car doesn't pull very hard under 3k in 3rd or 4th. I double clutch the 5-4 downsift on the highway for passing because when i don't the car jerks and it doesn't feel very good and i don't have any passing power in 5th. I do heel toe just to practice and because its fun. I am slowing the car down with the brakes into the turn then downshift so i can get power out of the turn.