It wasn’t in strikes before and certainly not story missions, the recommended power for strikes and story missions is way too low for this kind of modifier. Daybreak is a game changing modifier and only fits being added to the Reckoning. We don’t need it for nightfalls because they aren’t difficult anymore. The only reason it would be fine for Reckoning is because you can fail. Other activities would be way too easy!
Y3 of d1 is what I was referring too.