That's not necessarily true. Tvt, in particular is frustrating because you can't tank push into another terran base because of defending tanks. When both sides are turtling , you have no choice but to go BCs. Not because they want to, but because they have to. That means the other player will probably get BCs or ghosts to counter those BCs. Goliaths will be used also so you need more tanks to defend BCs from goliaths. SVs, wraiths are also brought in which makes things frustrating. This is the one mu where BCs actually serve a purpose.