RO2 is just a broader game with more to pay attention to. I think that's the main reason why everyone's default mode (other than the fact everyone is a sniper this game) is camping.
I'll put it this way. I played 3 rounds of Pavlov's House last night. Like always, I head for Zab's first for some free points. Immediately on capturing, there were Germans in the point. For the rest of the match, every time I would run past Zab's, there would be Germans in it, whether or not the point was actually capturable. I spent probably 10 minutes in one match killing Germans in Zab's even though it was a non-objective the whole time. I watched streams of Germans head for Zab's non-stop, and it was usually a squad that liked to go the very top and find a room to hide in, so they could spawn and continually put guys into Zab's.
It was really ****ing annoying. But what are you going to do? If you leave them behind, they shoot you in the back while you go for other objectives, or they're instantly capping the minute another objective is captured and the whole balance switches.
So whether or not I wanted to, I ended up fighting over Zab's for 3 solid rounds, sometimes for defense points, sometimes to just root out camping bastards who want to shoot down into our spawn point.
In a perfect world, some squads would attack, some would defend, and everyone would go to where the action is supposed to be.
In reality, in every single FPS game ever made, people do what they want and you're lucky if they decide team work is what they're about. For the rest, it's either individuals or whole squads doing goober stuff that honestly has nothing to do with the game at hand. They're just going through the routines they're used to.
What pisses me off, more than anything though, are the people that are clearly veterans doing the kind of **** that leads to stupid games. Like trying to pre-emptively camp objectives. It's no different than in other games where the first thing the enemy team does is run to the foot of your spawn so they can pin you there.