A lot of book readers know right away who most of those characters are and happen to care. The omission of Lady Stoneheart was VERY controversial among book readers around the time of Season 5. The lack of Arianne Martell and Darkstar were just two of the many reasons the show version of Dorne fell flat on its face. And Jeyne Poole's storyline going to Sansa in the show was one of the worst parts of Season 5 other than Dorne."if nothing else, the readers will learn what happened to Jeyne Poole, Lady Stoneheart, Penny and her pig, Skahaz Shavepate, Arianne Martell, Darkstar, Victarion Greyjoy, Ser Garlan the Gallant, Aegon VI"
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Okay, some of them I do remember, but still, I can't say I'm burning up at the thought of learning their fates.
I'll give you Penny, though. She's not only superfluous, she's terrible.