it's clear that those supporting the high school rule have never run in college. you are all fantasizing about your high school glory days because you were slow and couldn't even run D3.
The 6th runner is NOT considered a scoring member (as in their point total does not count towards the team score). Here is what World Athletics says:
In all races, IAAF member federations may enter a maximum of eight athletes, but no more than six shall be allowed to start in each race with four to score.
The team results are decided by the aggregate of places recorded by the scoring athletes of each team. The team with the lowest aggregate of points will be judged the winner.
If a team fails to finish with a complete scoring team, the runners finishing shall be counted as individuals in the race result and be eligible for the individual prize money (senior races only).
In assessing the aggregate, no adjustment to the scoring of the finishing teams shall be made in respect of any non-scoring team runners or of individual entries.
In the event of a tie, it shall be resolved in favour of the team whose last scoring member finishes nearer to first place.