That kind of arc works and produces a satisfying redemption. However, it sadly wasn’t what Lucas wanted to tell and the saga’s story suffers as a result. But hey, I buy Vader’s redemption infinitely more than I buy something like Snape’s redemption.
Really? What is it about Snape’s redemption you find unconvincing (bearing in mind I’m not the biggest Harry Potter connoisseur in the world, but I do like the series)?
If it had been Neville as the chosen one, Severus would’ve had no reason to become Albus’ spy. That and Snape loves tormenting children (especially Neville) and his backstory is vaguely incel-ish. The man takes out his psychological issues on kids and sees no reason to ever stop. Him being Albus’ spy doesn’t redeem him enough, certainly not enough for Harry to partially name his kid after him.
I love that we can now pick this book and movie series apart without judgement. Indeed, they were always shit!