I think it is more riskier a bad* kick than raising a foot alone.
I don't remember using kicks 'in real life' and even in training when things are a bit serious, I start using only super safe and defensive kicks, and lots of fake kicks just for step in. Because a bad kick is high risk.
*bad choice or quality
PS: Long time ago, I did great high kicks in a light contact competition. As it was light contact, the opponent was throwing me down after the connected kicks. I lost the combat (as throwings where more valuable). I love kicks, but I don't trust them as finishing techniques (since putting power on them compromises a lot my defence or follow up to the next move).