...and much less fire power

twins is not just about mindlessly attacking others. doing that would be ok for killing maybe one or two opponents but then you would simply get killed due to the damage you would sustain. there were more things you could do but simply can't any more with a twin. For example you simply can't circle an opponent while firing anymore cause you get damaged by your own shots, trying to do that from further away is simply impossible due to lack of space in most trucks and due to the low damage caused by your shots. So you can't use it in trucks suited for short range weapons and when using it in trucks for medium to long range weapons you are underpowered.

I totally agree with you, this completely changes the way you can use twins