It strikes me that this is even more obviously a turning point than it already is.

First: This is the first hint to Harry that he is not alone. All this story, Harry has been defined by his aloofness; the one person as "sane" as he is cannot be trusted, and for all that Hermione tries she's just more of a apprentice than a co-hero, she's not on the same scale that Harry acts on.

No longer. Harry knows, now, that there are more like him, and they too are smart, and competent, and they have gifts for him from hundreds of years in the past.

Second: This also solves one of the problems I had been worrying about, which was: How can Harry solve Death without it looking like a Deus ex Machina? Sanderson's First Law: magic cannot be used to solve a problem except where it is foreshadowed and constructed from existing effects. There's been a few ideas tossed around - Summon Death + True Patronus and the like - but they all seem to have... unhelpful side effects. (In particular, actually ending "Death" would be a bad thing, because Death kills bacteria as much as it kills humans. You want to destroy "Death of Humans" or come up with a mass-producible immortality elixir, not kill Death outright.)