With the introduction of runes reforged and bad balancing, riot managed to ruin every lane

Top- for some reason you made 3 damage rune trees and no bruiser tree so bruisers were bad for the first ~5 months of the season and tanks were mediocre. Then you introduced conqueror which made tanks a lot worse but put it in the precision tree. Now if I go resolve secondary on a bruiser with conqueror, my damage feels so bad, streamlining the game even more.

Jungle- The scuttle crab changes were terrible and almost every jungler that can't contest this is just a lot worse. It also introduced gold funneling which was a huge problem in pro play, and to counter this you made caster minions worth 4 gold if you have the most cs on the team which made more junglers worse. Electrocutes damage is also insane, and tanks are basically no longer found in the jungle.

Mid- Revert electrocute to thunderlords. Sure, you nerfed it, but it still does more damage. Now champions like zed/talon/leblanc were brought back and are able to 100-0 because of damage being insanely high and you refuse to realize that runes reforged was a failure. Snowballing became too prevalent and the introduction of stormrazor was just stupid, it buffed burst even more when it was already op. Also, for some reason you made lost chapter cost 1300 gold, when serrated dirk costs 1100 gold, and decreased every mage's mana, but not assassins mana, which may impact why leblanc got so strong.

Bot- Marksman were op early in the season, and then you nerfed so many different aspects of them at the same time making them irrelevant. To counter this you buffed stormrazor an insane amount when it already was a ridiculous item, but nerfing their late game by nerfing infinity edge. You however barely buffed essence reaver because it was op on lucian and now champs like jhin, xayah and ashe who used to buy essence reaver are being forced into other options (mainly stormrazor). Now all but like 6 adcs rush stormrazor, even though riot has stated "they like first item diversity." Stormrazor is just a stupid item and needs to be removed.

Support- This one is a little less obvious, but the change that made every supp item sightstone with no alternatives was a bad idea. Now supports are more streamlined and you introduced so much streamlining into the game at the same time, even though players like to be creative with their playstyles. You also nerfed enchanters, while frustrating to play against, they were not op. If anything this came at the wrong time and should have been during the ardent meta. Support also in general now feels less impactful and less fun to play.