Perhaps some people (like myself) don't want the CH kicking in every time there's a slight temperature fluctuation which takes it under the thermostat settings.
Ours is permanently switched off all year anyway, with just a press of the button required to switch it on when needed. I know an old lady who has hers switched off all year as she is oblivious to the cold. Brrrrr!
I guess it's down to personal preference as everyone has a different physiological make up.