Originally posted by: BOARD_of_command
Technically it's dumb, but logically it's to create more tension. If DBZ fighters would just completely incinerate the other guy in 2 seconds, it wouldn't be much fun to watch, not that it's fun anyways. If we see Naruto summon Gamabunta everytime and rape his opponents, it's no good then. Usually the point of the fights in anime is to show the protagonist's development and growth throughout the fight, as well as the struggles they go through in order to win.
I know what you're saying is true, but it's just made that way to increase the excitement. (excitement might now be a good word for that)