I have 12GB of ram... not as much as I'd like, but good enough for every other game I've played.
But even if you have 6GB of ram, you won't have nearly that available for running games.
I have 12GB, and even if I close EVERYTHING else, this game *WILL* creep up to 10GB and make my system start paging to disk, which even on SSD is damned slow in comparison. Even if I had 64GB of ram, I have zero doubt that this game would max that out as well. That is what memory leaks are, they have no limit.
But none of that matters, 4GB of RAM for this game is WAY more than it should need. It starts up with <2gb in use, and then the memory leak creeps it up much higher.
Games like War Thunder have far better graphics, far more players, far more vehicles, far bigger maps, far better terrain, etc, etc.... and they use less than 2GB.
Soooo..... its a bug, that was not addressed, therefore I won't be playing the game again until it is.