Instead of making all of the limbs detachable, we can just have them coil in. Just like when a cat or dog lays down. That way making the unit move doesn't take hours of re-attaching limbs back in. Tail, however, I understand completely for detaching.
Plus, I was kinda under impression that we can store the unit quite easily in. (main body's measures are around 2,2m x 3,2m x 6m, if taking in head.) Limbs might add 0,5-1,0 meters or so to the numbers when lying down, I think. Unless we need additional room for some extra things inside the main body, in which case I understand ST's point completely (Though, I want to bring up that Sarghress seem to be able to make power armor-sized golems
that still work. Even if we can't do that well, I don't see this thing being THAT big with the internal working parts and whatnot). Can't say anything 100% yet, as we haven't seen that much of golem interiors about anywhere.