Using vehicle already ensure much easier kills than infantry. (except fighter planes)
And “assist” scores works pretty “OP” for vehicles due to vehicles’ damage is more of AOE attack.
Meanwhile using infantry especially when not team cooperating, is at weaker side of the gameplay–lots of effort, but way less scores and reward than vehicles.
As I stated long time ago:
Using vehicle also ensures lots of different kinds of battlehero awards. While using infantry… You have to get >500/1000 scores in a single life/soldier to trigger that battle hero awards. For vehicles, getting >1000 scores in a single life isnt very easy?