Supports should not receive diminished gold after completing their support item

Part of what I think makes the support role good at the moment is that the support items give me more flexibility in my build path, and more gold that I can put toward actual items. This extra gold does fall off sooner than last season, but in many games I have been able to accumulate enough of an early advantage that I feel like a real champion by then.

I enjoy playing champions like Bard, Neeko, Pantheon, .. things that can actually get strong by starting out as a support.

Sometimes, come late game, I end actually needing to clear waves and even split push, either because I have the mobility or safety to do so when my teammates don't .. or they simply refuse to.

And then there are other times where my ADC disconnects, rage quits, or just abandoning their lane to try and force a lane swap for who knows what reason. I understand diminishing my gold before I complete the item, but if I have had to clear minions before that point, this just puts me in an awkward position sooner.

In comparison, jungle items give less minion gold if their gold from cs is greater than half of their gold from monsters, UNTIL they complete or ,

.... so why not do the same thing when I complete ?