Why is Teemo countered by a free trinket?
Honest question. It feels strange to me that any champion in the game can completely disable Teemo's ultimate by using the free red trinket. I would understand if enemies were using the red trinket to find and then eliminate the mushrooms but that is not what most people use it for that I've seen. Most just click 4 and run right through the shrooms, not having to worry about them activating and it feels extremely unfair especially since it lasts for 10 whole seconds and only has a 65 second cooldown.
So my question: Why was it decided that the red trinket should disable Teemo traps instead of just revealing them? I'm very interested to hear about this as with his ult disabled, Teemo's only other damaging ability is his q.