Yes... there are Guided Games for all activities except if you choose Heroic difficult.
That is what I get.
So Nightfall is included... I don't remember having an Heroic Nightfall difficult in Destiny.
There is Guided Games.
Guided Games only works if you're a solo player.
And the default Nightfall was Heroic difficulty in Destiny 1. Which means they made an easier one for Destiny 2, which defeats the purpose.