Manutoo do you still think faster motion animations not giving any advantage even visually? Did you tried to play online or compared those anims? It might not in game mechanics but for me it sure does visually atleast. also i feel when i play even against cpu master 10 cpu does get more difficulty defending i believe it faster motion swing animation reduces the reaction time of the opponent.
Your original anims like #3, #4 if you compared those to anim #15(Nadals BH) that i play also you implemented to the game since first day i believe. You will see how short preparation time helps to put more pressure on opponent. Its simply taking the ball early. Can you test this one more time. I never played against an opponent who doesn't play with fast motion bh. If there is no advantage why everybody plays with faster ones outside of me:)