Why does it matter if experienced players can do it easier at 25? No good player had problems with subway at 24, fr00b or not, if they couldn't solo it.. they got 1 OB and it was easy as pie. This 1 level could help newer players have a chance of killing the final boss, and giving them an enjoyable experience, it still won't be easy but as it's the first major boss in the game I think it's a nice boost for them.