Why we need to improve English pronunciation?

Answer 1

So that people can understand what you are saying.

You can get the grammar right, the vocab right, but if people can't understand what you are saying you can't communicate and that is the purpose of language - communication.

Answer 2

Improving English pronunciation is important for effective communication. Clear pronunciation helps avoid misunderstandings and ensures that your message is conveyed accurately. It also enhances your overall language proficiency and boosts your confidence when speaking in English.