Background: Destiny 2 is a co-op multiplayer FPS, and its pinnacle activity is 6-player raids, which requires players to combine fast-paced FPS gunplay, split-second reaction to mechanics, and coordination and communication with other players. This can be a daunting and overwhelming challenge for players new to the raid, even if they already are experienced in FPS gameplay.
Challenge: explain to a player, familiar with Destiny gameplay but new to the raid, the mechanics of an "encounter" in 5-15 minutes, live. It must be as concise as possible so as not to confuse or overwhelm them, and not stretch the patience of the other players already familiar with the encounter.
Too often I've see players start from the immediate aspects, working forwards towards the later/broader aspects of the encounter, but I find that in the firehose of information, by the time the explanation is complete, the player has forgotten the first, immediately important details: "wait, tell me again what am I supposed to shoot first?"
So the approach I've been experimenting with is to work backwards from the goal of the encounter, so as to finish with the most immediate, tactically important information, so it's freshest in their memory. I don't yet have enough data points to conclude whether this is a better approach ;)
In any case, I'm just barely wading into the immense topic that people have spent decades, careers, and PhDs on: teaching, but it is fascinating the breadth of choices one has in how to approach an explanation.
(I also play a fair bit of board games, and learning a new board game is the primary obstacle of adoption, so I really appreciate the OP author's points)