i took TKD for about 4 years and earned a high red belt.
I got into a street fight and was getting my ass kicked till i reverted to just sloppy punches and push kicks to keep the guy away from me long enough so i could land another hazy punch. Round house kicks and back kicks were for the most part useless and actually laughable from a bystander's POV.
Long story short i take Muay Thai now and in my opinion this is the best combat sport to practice.
" Keep away from those who try to belittle your ambitions. Small people always do that, but the really great make you believe that you too can become great." ~ Mark Twain