I don't want them wasting time on vehicles so you can jump ramps or do donuts for a few minutes when they could spend time making other features better. If you really wanted to "play fallout" then you wouldn't be asking for cars. Cars do not a fallout make.
And who are you to judge us?
1. You don't make the game.
2. You don't tell the players what they can and can't do.
Just because they implement vehicle doesn't mean it's going to take away from the core game. Just look at other games...Bad Company 2, GTA, etc. And are those games bad? No, they aren't. With the logic you use then I guess modeling a Radroach is too hard. "Oh noez, the game is going to svck now, it's so hard, I better go kill myself." Hard work pays off. Vehicles always make the game fun...