Hey All,
This sounds sort of a loaded question, doesn't it?
Are you asking about a 50/50 weighted front stance, Or a double weighted front stance?
As Chen XiaoWang explains, Double weighted is not so simple as 50% weight on each leg. It is then, as he explains, when a leg (and stance/structure in extrapolation) cannot move and both are 'stuck' and it is not when there is 50% of weight on each leg. If we see a 50/50 stance, we see not only is it a transition through stances, we also see it is as common as a typical Ma Bu horse stance and as obvious a movement as Taiji opening hands.
As the video lays it out, double weighted is the point at which one cannot continue to change and adapt in their structure, change one of the leg positions, or move the joints.
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CXW-right on target.