Riot never fixes real issues
There are 2 major mechanics in this game that always seems to cause so many problems in terms of balancing. Those are stealth and absurd amounts of heals. Stealth has always been an issue since the very beginning with champions like shaco, evelynn, or twitch making them incredibly unfun and unfair to play against with no real counter play. Surprisingly rengars ult is one of the most fair and balanced stealth in the game solely because it lets you know that he is nearby and is stealthed. honestly all champs stealth should have some sort of indicator like rengars that let you know they are nearby giving you at least 2 or 3 seconds to react instead of being like "oh shaco's here now. funny how there was no way of knowing that" and then dead before you can press a button. I really dont know a way to fix stealth besides something like that or just flat out removing it. Healing on the other hand i feel is a more recent issue. I say recent loosely tho cus its been a real problem for at least the last 2 seasons. there has been way to much healing in this game whether its in the champions kit or from runes, like seriously how many of the recent champions and reworks have built in sustain. it gets even worse when a team stacks healing. like senna taric bottom just cannot die with their heals. two ways to fix this are to simply buff grevious wounds to reduce healing by like 70% or to make it so consecutive heals gets more and more reduced. like if you get healed by an ability and then get healed by another ability within like idk 8 seconds the second ability does reduced healing and resets that 8 second timer so a 3rd heal is reduced even more than the second. I just wish riot would fix the issues that have been here for years instead of adding shit we dont need like new champions cause more issues.