1: BF maps used to be huge; maps in BC2 were tiny compared to maps like Zatar Wetlands [even the 16 person varient]. Hence the focus on squad based combat. 2: BF has historically not had weapon unlockes. Bf2 launched with only one tier of weapon upgrades per kit, and most of those were "meh" at best [Only the PKM really stood out]. Compared to that, BC2 has plenty of weapons/upgrades [too many I'd argue, as it takes away from the strategy of choosing a weapon].