Removal of Green jungle item
Overly strong in higher ELOs, heavily abused by Jax + Lee Sin. I'd like to have one more jungle item but this one was just too strong.
Removal of Sightstone
Why was this a bad thing? IMO the current support items accomplish the same thing, are more interactive, and incentivize you to actually complete the quests rather than just buy a sightstone with 800g.
Removal of Legacy cursor (wut)
https://www.reddit.com/r/leagueoflegends/comments/cjxhe8/riot_scruffy_notes_theyll_bring_back_the_legacy/
Removal on Twisted Treeline
(Old but still relevant) Removal of Dominion.
Both of these maps were very outdated, very unbalanced, and very unpopular.
I'm not happy about the removal but I also wasn't happy about the state of the modes in the first place. At the very least we should be able to play them in custom games.
Removal of Banner of Command (While quite silly, and occasionally awful or OP it was still good fun IMO)
Disgusting item, glad it's gone.
Removal of Revive
Can't really speak on this one since I didn't have much experience with it.
The dreaded IP --> BE change
What exactly is wrong with it? We got the conversion bonus, it's been proven on multiple occasions that it's easier to gain BE than IP, and we can also get BE from events.
The honor system overhaul
Okay, seriously I see so many complaints about our current Honor system but nobody can ever explain to me why it's bad.
In my multiple years of playing League with the old Honor system, I've never received a single ribbon, banner, or reward of any sort.
The new Honor system? Let's see, I periodically get free key fragments, I get 3 free ward skins, I get the ability to get Medieval Warwick or Twitch, and I get Honor orbs for even more free loot. Also, it's actually possible to get those levels in the first place. Anyone who played with the old Honor system will tell you how unbelievably hard it was to get rewarded from being Honored.