I question whether "people complaining to the VHSL" had anything to do with moving the game site. The primary requirement to host a state semi-final football game for 1a is seating for 2000. Other than that it is playability of the field that could be a factor, but that is a judgement call and almost never a factor. The minimum restroom requirement is only two bathroom stalls for each gender, and that is the standard for all six classes.
I am almost certain it was a decision made by the school administration. And probably with nothing but the best of intentions to provide the best venue possible for such an important event.
Certainly the Essex coach, and his players would probably prefer to be at their own field, and I know I would prefer that if it was me in that position. But, I know from past experience, there are a lot of factors that have to be considered and evaluated. I'm sure the decision to move the site was not done without carefull consideration.
Best of luck to both teams, and rain, rain, go away!