Total bulls***. Of course people played safe. That was the whole challenge. Beat it and stay safe. I liked the mechanic of that mode. You really had to play with thought and plan tactics. If they think changing it to a cool down timer is going to stop people cheesing it they are deluded. And moving it to level 40? What the f*** is that about? Now I can't play a mode I've been playing all year until I unlock it again? They can f*** right off, come back, and f*** off again.
I don't think the changes to Nightfall are meant to combat cheesing. Instead they are added to make the event more fun. Bungie said the Nightfall was intended to be a weekly ritual event for friends to test skill and allow players to optimize gear. The modifiers are still present to make things more challenging and not being kicked to orbit on a team wipe means players can play a little more aggressively for more fun and experimentation with different skills. I can understand you not liking the changes but they really don't sound all that bad. But luckily the flood of new great games is on the horizon so it should be easy for players to move on to other games if they wish.