@Riot Why do some vgu reworks change vo(trist,ryze) but then don't for some (MF,fiora, when)

Title. Very odd that when a big change happens to a champ like new lore, the way they look, and kit, they sometimes get some new vo to back it up. So just wondering why some updates like I said MF, fiora, and shen don't get it. Heck even purely visual ones like Alistar, singed, and Morgana got no changes even though they have like maybe 10 voicelines in general
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