I am aware of my accent, but getting e.g. vowel colours exactly right is just too much work for too little gain. What would be the advantage to matching a speci

I am aware of my accent, but getting e.g. vowel colours exactly right is just too much work for too little gain. What would be the advantage to matching a specific dialect exactly? I'm not a spy trying to pass as a native. On rare occasions that it matters, for instance for a play or for a song where people would notice a wrong accent, I can work to get it right on those particular words. It's a lot of work, but it's still easy compared to getting to the point where you do everything without thinking.