When you're on that first streak, you can use the success to track where you are. When you attack a target too tough, your win streak restarts from zero and the number of wins in a row just sits at your maximum *not* your current streak like some other successes.
As I'm trying to rebuild my streak, I'd like a counter I can see where I am as I'm clawing my way back. I've blown streaks now at 479 and just at 441 just moments ago (US4 and NU1). I've completed this success (500 wins in a row) on NU2, US2, and US3.