Oh, you have this thing where you believe things were less snowbally back then, when in fact the game snowballed EVEN HARDER back then.
You see, with less gold/xp from non-combat sources then the early-game differences from a team who gets early kills are much more magnified. If ambient gold is fairly low then the team who scores early kills gets ahead by A LOT.
By homogeneizing gold income games are shorter, less snowbally and everyone gets to enjoy their lategame fantasy, yes, even the supports. The fact that that fantasy is fairly strong for supports like Brand or Zyra is a balance issue on itself, but not a problem that requires changing core mechanics that have changed for the better in these past seasons.