This argument is not true at all. In team games you aren't responsible for the entire map (since the maps are larger...), therefore it can literally not be your fault that you've been cutoff and yet now every sector is getting nuked anyway
all 3 allied factions can build caches.
the only time it can be annoying is if you have brit emplacements. otherwise its easy to prevent it. even if a team mate doesnt want to build a cache there is noting stopping you from doing so.