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How much do you think players would put up with the ability of other players to change the game world?
Let's say, for example, you're level 20. You are using as a base X city. You go to X city to buy new gear, get repairs, craft stuff at the robot factory or blacksmith shop, train, bank, get quests from NPC's, etc.
For your level, or skill level, most of the cool stuff to explore is in Area A. It takes 5 real life minutes to get to area A. you do your quests, hunt mobs, whatever, back to the city now and then for character maintenance and so forth.
To get to Area A, you cross a bridge that is over a large canyon that you can't cross otherwise. To steep, if you go over the edge you die.
You go to the city, log off. Next day, you get some quests, and head off the Area A where you are meeting some guildees to complete quests, grind mobs, or collect resources, whatever.
You find, WTF?!!, the bridge is no longer there. Some other players have destroyed the bridge. You can still get to Area A, but now instead of 5 minutes, it takes 10 minutes, DOUBLE the time.
In this scenario, let's say the game is RvR. So, no one is ganking you as you log on, it's not FFA. You can PvE or craft in peace if you want to.
However, your game play has definitely been changed by other players. Is this ok, or do you feel "griefed", upset, ready to quit because some other players ruined your game play experience?
On the other hand, sometimes the game play change is positive. You go to the blacksmith for repairs, and find a new upgraded blacksmith, and repairs are now half price. Other players are responsible for installing this new blacksmith shop, but you benefit.