Ok, on that I can agree with you, if you take the lead in a trench game, it's very difficult to turn it around, but don't say it can be over T1, that isn't true.
I actually think that because of that, trench involve more strategy, because it doesn't allow you to do any mistake, one mistake can cost you the game. While in non trench if you miss smthg, you may still be able to break that bonus later.
