The subversion was not chosen deliberately. Stating so is ludicrous.
If it was not chosen deliberately, it would not have been a subversion. HOwever, I will accept your statement as "that specific pronounciation by a specific culture was not chosen deliberately".
But of course, you have links that state otherwise, right?
No, just personal experience. In partucular, growing up with 'mother', 'brother', 'worker', 'bigger', and '*****'.
One of these things is not like the other (as opposed to 'otha').