Winning against ncs is all but guaranteed for me,i honestly can't figure out why it is such a problem for others.
Against players,i usually win too,because i know the courses like the back of my hand and will be first/second at the first/second treasure chest so i can get in control of those.
I come up against players (usually 1,sometimes 2) every 10 races or so,and surely not every single one of those i'm beating is incompetent.
So no,you do not need to be a dash/headstarter to win the vast majority of your races.
Is the combo broken?I'd say so,but you'd need to be going up against that combo for 10%+ of your races to render dressage3 a wasted slot.Infact my math's poor on that,it may be a lot more because you're still getting 15% in any place finished,and it may very well be even with the same combo you would have still lost.