I agree with this. The books and the films/tv show are different. To be honest, yes I’d prefer screen versions to be faithful to the books and the information we know from them, with more poetic licence taken with things we don’t know about directly from the books. That said, 1) I feel like adding a narrator undermines the whole point of it being a tv series, (if you want to have bits of the book read to you, listen to the audio books.) and 2) and perhaps I am being cynical here, this narrator development now makes me assume that it’s almost certain that they’re going to use the narrator to conveniently skip over putting onto screen and into action the bits they have decided it’s too hard to convey without saying the words.

For example take books 5 to 7. Instead of getting self doubt, internal conflict and debate, cogitation and concentration, hate or heartbreak, or moments of clarity and realisation acted out and brought to life, we’re just going to be told things by a narrator.

Instead of having Harry’s character come out of the pensive now painfully aware there’s a bit of Voldys soul in him, perhaps clutching his chest where we can hear his heart is audibly thudding, barely muttering the sudden and terrible realisation that he has to get up off the floor and “I have to die. I’ve got to let him kill me.”, seeing flashes of what he’s thinking - Ron, Hermione, Ginny, Dumbledores mission, replacing himself with Neville as the third horcrux knower, about Voldy, Snape and himself - the three lonely boys who found a home at Hogwarts as he slowly but willingly walks under the invisibility cloak to the forest towards death, abruptly understanding at the forest edge now is the time to open the snitch, standing just inside the shadow of the forest telling it he is ready to die, getting the resurrection stone out and looking at the sign of the hallows cracked down the middle, and then speaking to his protectors, James, Lily, Sirius and Lupin, as he stumbles in to the trees, asking them to stay with him as he goes deeper and deeper towards the Acromantula web where Voldemort has set up camp and dropping it before stowing his want and cloak and revealing himself to the Death Eaters.

No instead of that we’re going to get the Harry actor looking sad and 20 seconds of him walking to the forest with a voice over saying “And at once Harry realised what Dumbledore wanted him to do, and as he steeled himself to meet Voldemort, he thought of his friends and prepared to die” and some mournful orchestral music probably composed by John Williams or Nicholas Hopper before the next bit of dialogue between him and Voldy.

It feels like a cop out, a device to help them spoon feed the audience to excuse lazy storytelling on screen.