Anything you don't approve of would be a massive waste of resources, it seems. If you highly disapproved of the planned gameplay, you'd likely sing a different tune.
And balance changes are pretty easy. Tweaking some numbers in a file. A slight waste of resources to hire an extra balance guy or two.
Its stupid to say no. The smart response is 'we need to see what populations will be like'. If(and obviously its a big if) populations are beyond the highest expectations, they'll probably need new servers anyway to support the populations. In which case things like this become reasonable and something the population can support, and a cost effective means to add new variety to the game.
I personally would highly support a 'to hell with rpg elements' server with zero leveling or certs. I'm just here for the fights, not character building.