Tom Huckaby,
In addition to the slow play issue, I think I'd explain the Cheater's Line to a begining player as a crutch or baby wheels and that while legal, that crutch or wheels might be removed, placing your son at a disadvantage in learning how to read and line up his putts.
Range finders are also legal, but, I don't use them.
An interesting event occured at my club this weekend.
A fellow who's about 75, who's been an outstanding player all of his life was complaining that our golf course hadn't been measured for SkyCaddy (it has in fact)
I told him, schmuck, you've been playing this golf course for 60 years, why in the world would you need SkyCaddy, you know every shot, every yardage to the foot, especially in light of the elevation changes and dogleg nature of some of the holes.
He thought for a moment, knowing that I had him.
And then he said, "yeah, you're right, the only trouble is, I can't remember them anymore" which was cute.
P.S. He can remember them and every sprinkler head is
marked.