If you pronounce TD you get to say a socially correct non-word "Tud" instead of my preferred non-socially correct pronunciation "Titty" or "Tiddy"
For example I hate banks but TD Bank is my favorite. Not because I ever use them, but because it sounds like where you go to stock up on all varieties of your favorite "Tiddies"
"Everyone's born anarchist and atheist until people start lying to them" ~ wise philosopher