I agree down and across as long as the hitter gets leveraged fyb.. From that position barrel depth and staying on plane is easy to achieve and not pulling off the ball.I have seen a lot of players lately with too vertical of a bat path. They aren't popping up, but they are hitting towering fly balls as easy outs to the outfield, because if the timing is not perfect they catch it a bit out front and up, up and away for an out. Some players need to take a flatter hand path which is usually achieved by the front arm. Hank's swing shows this. Pop ups result mainly in hitting the very bottom of the ball. If your path is too vertical, you can forget about a high strike or riseball.
I know everyone is jacked now on hitting homers and getting the ball in the air but I would take less homes for a lot higher average.
For the girls I have worked with with too vertical of a bat path I tell them to think down and across.
I prefer this over the above bat path.
View attachment 24658
More down and across
Sierra Romero "13 Homeruns in 60 Seconds" with ProSwings - YouTube