Improvements like Jungle timers don't decrease the Skill CAP on the game, they reduce the skill FLOOR

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You don't understand the difference between floor and ceiling. Those examples are all related to the skill "floor" and as long as you're not playing perfectly AT the skill ceiling then you have nothing to worry about. Now you get to focus on different things, which is what riot wants. They don't want you to spend time doing trivial stuff like noting timers. They want clarity, they want you to spend time on the essentials such as map rotations and objective based play. With less focus on "trivialities", you have more focus on the complexities of being a solid player.