Coming Back to League of Legends After a Year Break [Discussion]

Hey guys, I have been playing League of Legends for over 6 years now. I have taken short breaks before but this year I quit playing in the early days of 2018 because school has been getting tough and I had other priorities. I just reinstalled last week and after playing a couple games, I was absolutely shocked that this game's balance was still a shit show. I heard of assassins losing their ability to be assassins (tf happened to Khazix?), I saw AP mages with no items doing a crack-head amount of damage and more. I didn't mind losing because I know I had to learn how to play the game again and I know I wasn't playing the best, but this started to feel like Blizzard who was terrible at balancing PvP in most if not all their games (WoW and Overwatch primarily). Anyone just coming back feel the same? Is it because of a super long break? Is it only because I am still not used to the new "meta" or something? Is the imbalance done on purpose for the meta? Thanks for the responses =)