fielder, Welcome to the HSBBW.
I think any T-Work is beneficial.
You Learn proper mechanic's.
And good hand eye cordination.
Also use all the Tee.
Meaning set it high, set it low, set it inside and outside.
Don't adjust your feet to the Tee, Are to the position of the ball on the Tee.
Learn to take the low outside pitch to the opposite field.
Also Hit the ball from the middle to the inside of the ball.
Meaning don't hook it. Which is pulling the ball.
Hit the inside and Drive it to the gap's.
Is your son a senior or junior?
EH