Anyone else ever wonder what the purpose of hand seals is in jutsu?

Well, I have a theory....

According to my theory on the purpose of hand seals, it should be possible for shinobi to perform a jutsu without needing hand seals. Why is this? It's because the hand seals are used mearly to focus the jutsu users chakra in a particular point so that the jutsu may then be effected from the same point. Take "Fire Style: Great Fire Ball Jutsu" as an example, the jutsu hand seals are "Snake, Ram, Monkey, Boar, Horse, Tiger" it can be argued that these hand seals mearly focus a certain amount of chakra with a specific frequency in the user's lungs which then combusts as he breathes out creating a ball of fire. Seems logical enough... What do you think?

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