There has always been a similar variation in every cod.
The ghost on this game is very strict, even stopping to reload makes you ping up.
Even moving doesn't always keep you off the radar, the current ghost only works when moving forward.
You have to be going a reasonable speed as well.
I get where your coming from, but doesn't matter if the new vest is in the game or not. People are always going to camp.
Granted the assassin's vest will only enhance the campers skill.
If someone is proper camping a building, there are tools like grenades and drill charges etc to stop them.
If that doesn't work I will dump 100 rounds of LMG and wallbang.
If they are sniping and I die a couple of times, I will pull out my own sniper.