What is the Balance issue with buffing supports...
-If a support is buffed, the currently strong Adc's will be even stronger. -They will end up becoming Laners Like Lulu and will be extremely contested in LCS aswell as being obnoxious in solo queue -Edge of Night, Zhonya or any items that self peel someone will get nerfed and as such the compensation would be buffed supports, because it is a team game.
Currently supports are fine, they do what they do, look at Sona winrate still as high as ever like Blitzcrank. Just because your favorite support is Tahm Kench doesn't mean every support needs a buff. They don't need a Class rework they just need high playrate. But nobody wants to play support that is why mages are sent in the bottom lane. It feels more like an ARAM in the bottom lane than a ADC and their support relationship.