janna you can't be good at everything that is a job for

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So i genuinely have to ask. Why is such a thing a problem? Janna (similar to soraka) gives w up nearly everything else to be REALLY good at one thing. In her case its peel / disengage

Because she is so good at it that she invalidates others from the game. She isn't just good at it disengage, she is the best disengage and a good one will stop just about every melee champion, except Olaf from an ADC to a point that isn't enjoyable. Play a pure melee champion against a good Janna, enjoy the rage fest that is trying to kill the ADC, burning every summoner and active only for her to casually deny you as the ADC continues to pepper you. The only reason Janna doesn't see even more play is because the pros don't play her thankfully, but when one of your core items is mejais and you can safely and reliably build that shit because of your role, you are a dumb champion.

{quoted}

So i genuinely have to ask. Why is such a thing a problem? Janna (similar to soraka) gives w up nearly everything else to be REALLY good at one thing. In her case its peel / disengage

she also gets smashed in lane by most aggro supports i never see janna win lane in platinum