Kicking the legs?

How come you just don't see guys working the legs of a downed opponent much anymore?

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Mark Hominick vs. Shane Rice
Uploaded by mma-tv

In this video, Mark Hominick ends the fight with leg kicks.

Actually Shane took one to the bone in the ankle. It jacked his ankle bad!

ya. but they should of restarted from the mount!

that punch was a good one....

This was years ago in TKO. The rules of that promotion states that restarts then were to take place standing up.

That isn't what the thread is about though. Are leg kicks still effective in MMA? If so, why are people not using them.