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Why would you say that you can't sustain lag pressure?

You can but only for so long. I edited my post above for clarity. I think you can sustain lag pressure , should attempt to sustain lag pressure as long as is possible. Sustain a constant amount of lag pressure via a steady rate of acceleration. But once the clubheads rate of acceleration declines even though you may be still accelerating Lag Pressure is fading away and once the club passes the hands , settles into angular deceleration Lag Pressure is all gone. Similar to how you dont feel pushed back into an airplanes seat when the plane reaches full speed. No acceleration no lag pressure. You want to accelerate gradually , at a steady rate , not start off at a rate you cant maintain (over acceleration the menace that stalks all lag and drag). It'll feel heavy.

The intention to sustain it past impact , past low point all the way to Both Arms Straight is a good one though.....

Here's something else to consider. Can you have too much lag? If talking Lag Pressure as a product of acceleration : Yes. You dont want to hit a three foot put with 40 yards worth of Lag Pressure do you.

See 2-M-2 POWER REGULATION. Clubhead Lag Pressure Point pressure (6-C) is the Power Regulator. It meters out Power by sensing Clubhead Acceleration Rate and Direction.

Im no scientist though.......could be wrong again.