Lets face it, we have had it easy for the last month or so with multiple burns etc. Nightfalls should be difficult and make you need to work as a team / be crafty as a solo ninja due to the (generally) good rewards.
I've been looking forward to a non burn week for a while :).
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None of the nightfalls are difficult. On most, the burns do make them harder. Having no burns just make the boss fight take longer. Time of completion doesn't directly translate to difficulty.