Since both users and Rioters have been claiming that Varus old lore was "complete" or a "dead end"..
Since so many people have been claiming that Varus "needed" such a drastic rewrite to open his lore for future stories and such I thought I'd offer my 2 cent on why this is a pretty disingenuous argument. First of all: Yes, it is true that old Varus' arc was fairly complete and there wasn't that much room to explore with him (allthough far from none). However, in no way does this imply a need or justification for rewriting his lore from the ground up, like Riot opted to do. In fact I would argue that it would have been exceptionally easy to achieve pretty much the same thing the new story did by changing just a select few things about his original lore.
An example:
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The bow turns out to be a Darkin, same as new lore. This isn't even really a retcon, more of an elaboration, since the nature of the corruption was never really explored.
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Instead of inevitably succumbing to corruption, he is in principle able to fight it - with uncertain outcome- A fairly minimal change that would require not more than a line or two to be replaced from his old lore.
With these little changes his story is fairly open ended all of a sudden, with a plethora of stories that could be explored. Will this vengeful, despaired man find something to live for again? Maybe with the help of other champions, through companionship, or even a new love? Even when the Darkin tries to steer him towards vengeance and bloodshed - possibly with the aid of his siblings? And what about the Noxian champions? Does he blame them for what happened to him? Were some of them possibly even involved in it, and are a target for his vengeance?
All possible stories to be told while leaving pretty much 90% of his old lore intact. And this was just an example to show that it's possible. Riot doesn't even need to keep that much. If they have bigger plans for him, they should go ahead - I'm sure their paid writers could come up with something miles better than me if they actually put their mind to expanding rather than replacing. But the core character should still be present and recognizable after the fact. Like it was with GP and MF for example.
All this just goes to show that removing the actual character Varus from the lore was not necessary to achieve the stated goals of the new lore. Heck, I don't even hate the new lore on it's own. But when I think about how a perfectly intact and interesting character I somewhat cared about was straight up deleted from the lore for it? Yes, that makes me hate it.