You know, this is an interesting discussion. You are right, this is causing some degree of predictability in the early-game build order, which is most certainly not my intention. I am going to experiment around with adding some new anti-forcefield missiles, which I think will be a big hit. They won't require knowledge, so you can use those in place of bombers and get rid of the force fields that way. They will probably come with a small AI progress increase on use, to deter players from just using them indiscriminately, since I want to make these cheap enough to use during the early game.