People in our HS apply ED2: 1) as their top remaining choice if they didn’t get into an ED1/EA/rolling school that answered before the ED2 deadline and 2) if they feel they need to show strong first semester senior year grades before putting in the ED application.
I don’t think know of anyone who has a problem with the way our HS does things and it may be a factor in why the school has such strong relationships with many colleges.
Anyway, the OP should do what he/she wants within the bounds of what his/her fully informed guidance counselor feels is appropriate.