Yeah, I admit it's certainly not only a budget issue, but obviously some flashing curvy lines are easier to draw and animate than actual sword swings in an intelligent manner. True, it's also a tradition of trying to depict a fight faster than an eye can follow. It's just unfortunate that the result is an Errol Flynn fight faster than an eye can follow, where the purpose seems to be to hit the opponent's sword as many times as you can. It's actually even worse if the fighters are more powerful, resulting in a fight that's only colourful lines filling the sky, as the combatants are jumping/flying around, clashing here and there, but it's too fast to comprehend.