https://universe-meeps.leagueoflegends.com/v1/assets/images/homebound-splash.jpg
https://youtu.be/BWjbBlvf9cw
https://youtu.be/3Eu7NzzHC84?t=97
https://youtu.be/ZjvDFvzfxsQ
Homebound, Dark Passage, The Climb, Shadow's Embrace, then Senna's release. But sure, keep telling yourself the lore doesn't progress.
Anyone who says that or rides on the "but the constant retcons" train immediately proves they haven't thought about it twice.
For your original point, that "it doesn't feel the same", sure.
Institute of War lore was goofy. It was a bunch of self-inserts and they could go wild with the backstories. Dark kid playing with a fire bear? Sure. Dude too angry to die (maybe even x2 or x3)? Haha, go ahead lol. A godlike ice phoenix fighting alongside a prince and a cop against an electrical furry and a rat with poison? No problem, and the two furries would probably win. How many times did we have the "being from a different world/dimension" backstory? How many different worlds? I can remember Kayle and Morgana, Nasus and Renekton, Taric, the Darkin, Fiddlesticks all being alien entities, and let's not get started on the void champions. But Riot decided that's not what they want: They want a real, rich fantasy universe, with myths, stories and history. And for that, the gameplay itself can not be canon, even if I understand that this is part of the original appeal of League, that your games matter. (They usually didn't, but that's besides the point).
This is where the reboot comes in. They even showed us some of the Legends of Runeterra, maybe you have heard of that? I hear it's quite a good game.
So yes, of course it feels different, because it is. Riot chose a vastly different approach, however I would argue it's way better to have independent characters instead of being controlled by some shady summoners telling each other they fucked their mothers, to fuck themselves, to kill themselves, that everyone else is a "re****" and "hardstuck".
I can understand if not everyone likes the new lore. But you can't deny it is a thing, with a book coming out soon, the third comic series starting in November. There are a lot of people who enjoy it, and the Rioters behind it sure enjoy creating it.
https://www.twitch.tv/videos/495050165?t=02h16m05s