I don't get it, do the devs purposely handicap NA trucks?

I might play a bit different than other in that I like to use North American trucks on NA maps and Russian trucks on Russian/eastern maps. When going back and forth between maps with this play style it becomes sooo apparent just how far behind the American trucks are.

For instance, I got excited when they added the Mack Defense, cause finally a true western military truck was getting added. Instead they gave it a terrible collision model and made it so damn thirsty that gas is always of concern. they fixed the collision, but the think still drink like an uncle at a wedding, part in thanks to the devs ensuring to punished it for being AWD. Rather than just give it access to Special/Advanced Special gearbox, They literally went OUT OF THEIR WAY to make a new gearbox that, while less of a punishment for AWD, still give you an extra hit for something you have no control over since AWD is locked on. The Russian counterparts don't share this weird gearbox, they get the Special/Advanced Special, they get bigger tires too, full time diff lock also, better collision models to boot, etc. What gives?

Another example. I decided to grab the Kenworth pack to try the C500. The front end seems to snag and catch more then the Azov 7 despite visually being at least twice the height. It also behave like the rear axle is fixed at times and a little rock in the road will send the rear of the truck jumping a meter in the air. WTF?

Even going back to vanilla trucks like the BM17, one of the few 50+ inch NA trucks. It doesn't get lockers, and its suspension behaves as if someone forgot to install shocks at the factory and you just bounce around all over the place.

Kenworth 963, and pretty much all NA heavies, feel underwhelming on power compared to Russin heavies.

NA's offroad class trucks being mostly limited to 47" max on tires...

The list goes on, but the question is why? There's no need for needlessly making, what should be very capable NA trucks, always the worse choice when it comes to playing the game.