Point is, they are so big, "largely whole" is a good as we will get.
For one, that's a fucking lot of Titans and tanks and other heavy mahcinery.
Two, they can build escorts by the thousand, but we know they have trouble building and replacing Capitals. Mass Conveyors are bigger than Battleships. Good luck finding more.
Three, we are ultimately playing for time. If we largely criople their main trust and take out half or more of their most dangerous assets, we've essentially won the first phase.
@Durin
1. From what we know/guess, how much of Legio Crucis is aboard those Conveyors?
2. Is it likely that they have more of them?
3. Can they meaningfully transport Titans without Mass Conveyors?