Are you ACTUALLY complaining that champs such as Soraka, Sona and Janna are doing damage and being proactive as opposed to sitting behind their AD... Ahem Marksman... and just shielding/healing them non-stop?!
Also, what's this about drawbacks... I didnt realize there needed to be drawbacks for going Sorcery (or any other path for that matter)
The drawback is in the fact that you're missing out on other path's keystones/runes that could potentially be better...
Assassins
"with these runes they can no problem go domination tree kinda for free with 0 drawbacks and thus... they can do a fucking shit ton of damage"
Marksmen
"with these runes they can no problem go precision tree kinda for free with 0 drawbacks and thus... they can do a fucking shit ton of damage"
Tanks/Supports
"with these runes they can no problem go resolve/inspiration tree kinda for free with 0 drawbacks and thus... they can have a fucking shit ton of tankiness/utility"
See, anyone can do this...
But what you're conveniently leaving out is that said supports aren't the only ones that get runes, so do you and the rest of your/enemy team...