Am I wrong, or are leg kicks (other than those targetting the knee for self-defense) a waste of time in modern MMA and street fights?

Sean O'Malley lost his fight, because he broke his own foot while leg kicking Chito, then he lost due to unanswered strikes.

I wonder how many times we've seen fighters break their own foot, ankle, or shin bones while leg kicking over the years. Even Chandler got beat one time due to breaking his own ankle with a leg kick.

Am I wrong, or are leg kicks (other than those targetting the knee for self-defense) a waste of time in modern MMA and street fights?
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