...IMHO they have a dearth of packaging attention-to-detail.
Those details in and of themselves have no mass to speak of. If details like that are provided the freedom to ride in a package without any possible contact with surrounding material....rigid foam, taut clearwrap, vacuum-formed shells with no clearance pockets, etc...there's minimal chance that shipping stresses should occur to the point of part breakage. Parts that shake loose without 'breakage' due to inadequate press-fit or adhesive?....that's another thing entirely, and I, for one would give it a 'tsk-tsk' and take care of it myself.
Here's an idea, though... Why not return to packaging techniques that folks like Kato learned years ago....for their far less massive N-scale products?? Example: Observation car antenna. Simply package the antenna separately in a sealed package with any instructions for assembly to the car. No, Lionel won't reduce the price. Yes, you're going to have to acquire some basic skills along the road to happiness in this hobby...or find someone who has them.
Peace and safety.
If the packaging doesn't touch the roof antenna it doesn't break unless it left the factory that way. It's not like these cars are flopping all over the boxes in shipment.