Akd's point is definitely plausible for real-life, but in CM I would argue that there is higher value to decentralizing AT capability within a squad.
When the RPG gunner goes down in CM and there is an armored threat nearby, another team member cannot simply pick up the RPG and have a chance to quickly counter the threat. We have to go through the buddy aid mechanic and if the RPG gunner is "unfortunately" wounded rather than killed the buddy aid process can take disastrously long, if it even occurs at all under pressure.
Rather than getting into the buddy aid mechanics can of worms it might make more sense to add the RPG-27 to the game at least as an aquirable weapon. It could bridge the flexibly gap between CM and real life AT weapon sharing while being fairly realistic.