Leg bridging is a solid concept.
I strongly disagree on "destroying the bridge". Why destroy a bridge that you should walk across it? A fake is just wasted time and effort.
In my mantis school we:
Build a bridge (叫 - jiào),
Sense the enemy's reaction (聽 粘 黏 - tīng zhān nián)
Move across the bridge with strikes (進 - jìn),
Stick to the enemy if he tries to escape (貼 - tiē),
Overwhelm the enemy with Strikes, Locks or Throws (打 拿 摔 - dǎ ná shuāi)
Destroying a bridge would only lead to having to build a new bridge. Which equals wasting time.
Leg bridges are a huge part of mantis techniques in my school. I believe this is the main purpose of the seven star step/hook shaped foot.