What drawbacks are there to picking Rakan?

I'm genuinely curious if there is anything you lose out of picking Rakan, as opposed to other supports. You have an engage, healer, sheilder with scaling AP. There seem to be no cons at all to playing this champion as opposed to literally anything else. There is no reason to play anything else. You lose nothing by picking this champion. Now, if you play {{champion:201}} {{champion:63}} {{champion:40}} you're losing engage, healing/sheilding, or damage. If you have further insight to playing against Rakan, please let me know for my own sanity.
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