Why might a programmer and want to define his or her own own functions what are some potential disadvantages how might new functions and make people getting more complicated

We have to define our functions as well, and that is known as the user-defined functions. And to be precise we should not worry at all, as there is no potential disadvantage of the functions we define on our own. The only disadvantage can be that it might not be in a standard format. However, we have design patterns now, and each programmer knows the required format hence. However, for a layman, this can be a problem. And that is the only potential disadvantage related to the user-defined function.

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