I totally agree with you Grudgie but there is a point to where a language "devolves" and becomes less able to convey information, as is it's purpose.
As a non native English speaker I understand that the whole point of talking a certain way is for the people you talk to, not yourself.
Say you have uncommon dialect as compared to the area you live in, it is hampering you from expressing yourself, and it would benefit you to conform.
But if you deem a word, phrase or concept foreign to that area better then it's counterpart, use it!
Stand out! Don't let your conformity strip you of your culture or personal individualism. There is a balance is all I'm trying to say.