Sure - it's a plethora of different moves and potential situations to use them, unless you're getting jumped every singly day of your life generally have few opportunities to use them. I can't even remember 90% of what I learned.
That said, when I trained (ages ago now) it improved my fitness (key in a fight), stamina, accuracy and I learned a bit more about body kinetics. Taking hits during sparring improved defensive work and gives one an idea of their strengths and weaknesses, so it wasn't a complete waste of time IMO.
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