When turned properly with the pelvis tucked the weight distribution is more 60/40 and not mostly on the rear leg.
...... Mostly means as regards the greater part or number. 60% on the rear leg is mostly on the rear leg.
Due to the pelvic tuck the front leg can be very quickly utilized for a kick without having to shift the weight onto the rear leg.
Because the weight is mostly on the rear leg already...
From that position the only kick you could do with the front leg would be a low inside oblique kick, but the kick wouldn't have much support and in that position your mobility is already compromised against an opponent who continues to face and attack center, being with most of your weight on the rear leg and no third leg for support behind you on the new line the skilled opponent would take. Lifting onto one leg would just make things worse. It happens very fast. That's why I say you need to affect their facing, and not instead be forced to turn by them. Otherwise you're their puppet.
The hips and shoulders are not turned 'away' from the target but the body is shifted to the quarter angle and the center is facing directly into the opponents core.
Maybe I'm not understanding the photo because there is no opponent there for reference, but I've seen this move done plenty of times. In the photo, his feet, hips, and shoulders are facing the camera, but his
bong,
wu, and eyes are facing to his right, suggesting that's where the attack is coming from, which means he's shifted his body to evade the line of attack and is no longer squared to the opponent.
I would call that turning away from the target, as all of his weapons don't have equal reach. That's why instead of being able to attack directly from
wu, a
laap-sau is most often the follow up so the
bong hand which is closer can attack, also because the sticky, yielding
bong only helps to avoid the punch but doesn't clear a direct striking line for the rear hand. Hence, the need to
laap.
If the
bong-sau is used to ballistically displace the opponent's limb and affected their facing, no
laap-sau would be necessary and the
wu-sau could strike directly and immediately into the opened space without turning, shifting weight, or otherwise affecting our own freedom of mobility, while also keeping two striking hands free to attack.
I want two feet with the freedom to move in and attack from either side and two free hands with equal reach attacking a flanked opponent... not a shifted stance with one side overloaded and a turned upper body with unequal reach from both hands requiring superfluous defensive actions in passive response to my opponent. Real fighting speeds and pressure are simply too fast and chaotic, and this would get one plowed over.