I just spectated this high elo match and I would like an explanation

https://matchhistory.na.leagueoflegends.com/en/#match-details/NA1/2971330960/50889244?tab=stats Why did the 5/7 support Zyra have the most champ damage out of anyone in the entire match? Why did Zed go 17/1 and pop everything when he's trash in high elo? Why did Vayne do a mere 20% of her champ damage as true damage when her W is so OP? Was Irelia gutted? If so, why is she still picked? Is this a clown fiesta? Are people okay with this sort of thing? What happened to the game I started playing eight years ago? THE SUPPORT DID THE MOST DAMAGE. IN THE ENTIRE GAME.
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