When nepotism exists, those positions filled unfairly will take away roster spots from deserving players regardless of the tryout method used. There are other points to consider too:

-Not all players with connections are undeserving of their roster spots.
-A two hour tryout is never fair considering that two hours is not a very long time. It is nearly impossible to whittle down from 150 to 25 (or even 50) with only two hours worth of lacrosse.
-A poor player can hide their weak spots for two hours
-A great player can lack the reps to showcase their greatness
-Height/Size is the 1st thing coaches will notice and I can tell you the team will be a lot taller than it should be given not all lacrosse skill, talent and heart is derived from height

A strong player should want both their two hour performance and their overall resume taken into consideration for team selection