The left wrist is not a pressure point. Like you mentioned, the last three fingers of the left hand are (6-C-1 #2).
Left Wrist Cock is the 2nd Power Accumulator- see 6-B-2-0.
Power is applied to the Pressure Points by Power Accumulators (6-B-0).
What do you mean by "directly loading the left wrist"? Swingers use Drag Loading (10-19-C).
Ideally, your Left Wrist Cock should be initiated by the weight of the club, rather than a conscious manipulation of the hands. Generally, you see younger kids or physically weaker players Cock their wrist earlier because the club feels lighter that way. They employ more of a Full Sweep Loading Action (10-22-A).
Monitor Pressure Point #3. It's the King of all Pressure Points in my opinion. It Traces the Straight Plane Line. It directs Thrust towards Inside Aft Quadrant of Ball or Aiming Point. It's a sensor for Lag Pressure and hence controls distance.
Yes, always pay attention to the Hands as a whole, not just Left Wrist. This ensures your Flying Wedges and other critical alignments are properly assembled. Remember that Hands belong to Zone #3 (9-3). Zone #3 is only as good as your Zone #1 (Pivot/Body) and #2 (Arms).