[bts]

2-J-2 INSIDE-OUT IMPACT ...
The ball should always be struck prior to the low point of the Downstroke, even when using the Driver, except under special conditions or to produce a special effect, which is a separate area of consideration.

When I see the pros hit drivers they leave the wooden tee in the ground undisturbed. So if the bottom of the ball is level with the bottom of the driver at impact, why tee the ball up at all? I can understand that if the teebox surface is irregular it might be necessary to tee the ball up a little, to clear the irregularities.

Also, I often see players using long wooden tees of 4" or more, so are we no longer concerned with the lie angle of the clubhead when hitting the driver?

"prior to the low point of the Downstroke" can be regarded as "prior to the shaft being in-line with the leading arm", which also means "prior to release (throwaway)" when the pivot is vertical to the ground.

The clubhead can pass the low point and start to move upward (relative to the level ground) at impact "prior to the shaft being in-line with the leading arm" or "prior to release (throwaway)" when the pivot is tilted away from the target. The ball needs to be teed up to allow the above to happen without hitting it fat.

Hackers usually hit the ball "after the shaft passing the in-line condition with the leading arm" or "after release (throwaway)", regardless of pivot position.