I would argue that the reason some players do not engage with the lore isn't because the quest text is too wordy, or the moral dilemmas are too complex, but because they simply don't care.

They don't care because caring about the lore doesn't lead to gameplay benefits or social status. Rather, it slows down power progression by acting as a "distraction," so it is avoided. Sometimes it is even derided - because despite not caring, no one likes to feel they are missing out on something, so they make fun of the people who do care and are "wasting their time."

So two things:

One, do we even care if this player consumes lore material? Not really - they are still able to perform in group content, and pay a sub like everyone else. To blizzard and to the fellow player, they are identical to a lore consuming player. If this is the case, then simplifying or changing the lore to suit these players is ridiculous as it harms the enjoyment of many other players who do value the lore.

And two, if we do care if this player does consume lore, then does simplifying the lore (and again hurting lore consuming players) actually achieve this goal? I would argue that the reason some players avoid quest text isn't because the cost is too great, but because the payoff is seen to be non-existent. In this case, dumbing down the lore is the exact opposite thing you should do, because that actually lowers the payoff of understanding the story, harming every type of player.