the moment you suggest to add skillshots to support champions support players lose their minds
because riot has cemented the idea of unskillful, low risk high reward point and click gameplay into the support role and the support playerbase hates the idea of actually having to play the game like the rest of us

Your forgot even more. In fact, Sona's ultimate has bee almost verbatim the same in her kit from her launch, as has Janna's tornado.
aren't helping that issue though.