oh yeah, ive mentioned this a really long time ago actually!! ive even been looking to see how hard/time consuming of a project it would be to pull audio clips from other sources the voice actors have been in to add more random dialogue. i felt like arcade had so little, but it also turns out a few lines are locked until you get into his quest. i think with vulpes it might actually have to do with intelligence though, because arcade is the only one who recognizes him. and with fnv i think its more like conversations are between you and the npc only, companions dont/cant interact, so i guessed boone doesnt know the courier gets the mark of caesar. meanwhile fo4 has the cinematic approach and voiced protags so its more natural and easier to let the companions interlude between conversations between player/npc. like when you take arcade to the fort, he does react but it isnt until your actually in the fort, after the long ass boat ride. it also seems like they did have more content for the companions, like a cut part with cass where you wake up hungover and married to give you the real vegas experience. but ya know, bethesda'd again with that practically impossible deadline.