When I started cycling "seriously" about 50 years ago....(bloody hell, more than 50 years ago) ... the received wisdom was to ride fixed wheel (i.e. not freewheel) to start with as you learnt how to ride properly. This was just as well, as I could not afford gears anyway. Looking back, I can see that it does give confidence and control on a bike. Having returned to cycling after retirement, I can balance better than most in my age-group on a bike, am more confident cleated, and know how to conserve speed on descents to enable getting up the inevitable climb on the other side. I think this is mostly down to riding fixed a lot when young. I still ride fixed on sunny days when I take my Dad's old race bike out for an airing. He always rode fixed, even for time-trials. I have an idea it was obligatory in those days, but don't know for sure.