Amazing. I never knew that rule.
Every league I've been in had a league by-law, that the tardy bowler had either to the start of the 3rd frame or the start of the 5th frame to bowl the entire game. One of my current league even goes so far as the specify that even if the late bowler is just entering the front doors by the end of the 4th frame, he is "on time".
I guess that's why the leagues had that rule.
The USBC rule makes sense, but there's too many legitimate reasons why someone can be late. Every teammate of mine, who was late, has called, especially in this age where everyone has a hand held/pocket phone. Even before them, people called the house phone and the desk called the team captain to the the front desk for the message.