Why should we learn programming languages instead we have pre-programmed objects

Answer 1

Because knowledge in programming languages is important to understand how a piece of code works, and pre-programmed objects won't always function like you expect it to. Combining codes which are generated through pre-programmed objects is also tedious, and impossible without knowledge in programming languages.

The entire idea of this question is like: Why do we have to learn to drive if we can take the bus. While the latter works too, it's always better to master the former.

Answer 2

@Hatsy why do we have to learn making cookies when we can buy them...

Answer 3

Learning Programming helps you achieve more precise targets than pre-programmed objects can.

Just like than analogy of the bus and your personal car, the bus can take you to a general point but a personal car can take you further.