WTF happened to this game in the last 18 months?

So I just came back from a long break. Can someone explain me some stuff I really don't seem to understand? I really don't get what riot was thinking when they started the current season. Why are there true dmg "supporters" with a dash and stealth that snowball harder than any midlaner? What happened to adcs? I only see double AP botlane and mostly the supporter is stronger than the actual "ADC" or should I call him "APC"? Why did I get into Iron 2 after winning like 6 games in promotion and after being plat/diamond when I last played the game? I admit I'm a bit salty but I really see no reason for most of the stuff currently going on. Thanks for the help
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We're testing a new feature that gives the option to view discussion comments in chronological order. Some testers have pointed out situations in which they feel a linear view could be helpful, so we'd like see how you guys make use of it.

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