For the writing to never tongue in cheek say that the Warrior of Light has seven adventurers waiting off screen to help fight primals like it kept doing in Stormblood ever again. It really strains my suspension of disbelief when the story presents the Warrior of Light as being either alone or only having the Scions/Named NPCs with them 99% of the time in Cutscenes, Solo duties, and in terms of the overall plot only for it to occasionally say "Also there's these seven adventurers off screen who help with the primals teehee, don't question why they don't help with anything else". It doesn't help that there's moments where it absolutely would not make sense for the Warrior of Light to have help to fight a primal, like when they get blindsided by the summoning of a Primal as during the first fight with Ifrit or when Tsukuyomi is summoned which makes all of Stormblood's insistence that OH NO THE WARRIOR OF LIGHT COULDN'T POSSIBLY FIGHT A PRIMAL ALONE fall even more flat.

It actually doesn't strain my suspension of disbelief at all to assume that the other members in a DF duty are either gameplay abstractions because it's an MMO so of course the content is going to be multiplayer, or stand-ins for the NPCs who'd canonically be there. Shadowbringers doesn't ever call attention to it because it outside of when back up is literally summoned through magical means, which makes sense in the context of what's happening rather than it just being bad flavor text that takes you out of the moment and it's much better for it.