hello. our teacher in the last term of English course told us some thing like that. in that time i considered: "yeah! he is right" but after months i want to disagree somehow. I think always there should be a measure in every language to help people talk similar of each other. because the purpose of learning a language is possibility of making conversation with others and if every one has an individual accent it makes other to not understand him/her totally.

the same happen for me when i talked with an Indian, no offend, but i didn't get him! so i decided to pay attention to developing of my accent