Always wear a helmet as law requires it, but swap between full face and small open face depending on weather.
Often 'dream' of a ride out in sunshine totally free without helmet but not sure if I would, even if I could.
Guess the bottom line is, you can do anything you want in life as long as you are prepared to accept the consequences. How you imagine those consequences is a purely personal thing. Whether the law should dicatate your preference on wearing a helmet is another matter .....

Mike.