Why?

[JetMetFan]

I officiate - among other things - girls' basketball in NY State where we use modified NCAA women's rules and mechanics. Under the NYSGBOA, here is the mechanic for administering frontcourt endline throw-ins on the table side of the floor:

If the throw-in is to be administered by the lead on the tableside half of the floor the lead administers the throw-in by handing or bouncing the ball to the thrower-in and then backing across the lane. This is being done to facilitate communication with the sideline

Now try explaining to poor new guy why, in NFHS, we hand the ball to the throw-in team for frontcourt enline throw-ins!