Is there a reason that Kayle's rank 1 ult has one of the longest CD's in the game?

It's 160 seconds if you didn't know. The question, is why? It was 100 seconds before her rework; what could possibly justify raising the CD of her ult by a full minute? Please tell me, because I'd really like to know. How am I supposed to compete with other champs when their ults come up nearly twice as quickly as mine on average? It's not like Kayle's ult is some instawin ult that makes her impossible to deal with.
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