A small change that could make a huge impact on balance
I was looking a youtube video by TheValkrin who was saying we might need more then 3 ban picks in ranked. And I wondered if the wouldn't be a batter approach to this.
What if each time a champion win a match he would lose 0.01¹ gp/5 from his base stats and likewise would gain 0.01 gp/5 when he lose a game. It wouldn't make a noticeable difference for anyone but on the course of thousands of games weaker champions with low win rate would end up with a slight advantage in gold. Which would increase until inevitably their win rate evens out at 50%.
I don't think it would be noticeable for anyone. just gives a few hundreds extra gold to a bad champion after 20 minutes and he will become much more competitive without breaking anything in the game.
Riot could of course make any change possible to avoid such gold discrepancy between champions. But it would quickly solve any problem of OP or UP champions. Even if they benefit from a brand new unpredictable change to an item. They would quickly return to 50% win rate no matter how hard you try to abuse of it.