Can someone explain to me why Kindred is so contested?

When I play them I feel like no matter how well I play with them at the beginning of the game, around mid game I start dying and become very irrelevant as the late game comes into play. Can someone give me some advice for them/ tell me why they are allegedly so strong? Edit: Why am I being downvoted? I'm asking a genuine question and someone feels the need to downvote. Brilliant work league community. Bet you never scare away new players.
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