coin drops shouldn't be visible to enemies
When you're hiding in a bush waiting to maul your enemy bot lane, it's supposed to be sneaky. But if you're building the Coin line, it won't be. Enemies shouldn't be able to see your mana and gold coins. Not only is it confusing (that very, very vague red aura does NOT help), but it's damaging to your gameplay.
If your enemies can see where the coins are, they know where to attack next or even know that you're there when you don't want them to. There's pretty much no point to hiding in the bushes if the enemy sees coins dropping right next to it. Also, if both supps are building coin, you can't tell what coins are yours. As I said before, the very vague red aura doesn't help.
Coins should only be visible to your team; enemies shouldn't see them.