When and why did League games go from somewhat normal to super oppressive?

It feels that the game is becoming more and more oppressive when it comes to champion kits, the amount of crowd control, overall damage. I don't remember the game being like this in season 4 and 5, but after season 6, things really started to spiral out of control and games became much more stompy, stressful and you felt oppressed by many more champions than back in the days of S4 and 5. Why?
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