What is even the reason for Garden of thorns' seeds being WAY weaker?

Unlike Rampant growth (W), passive seeds: 1. They last half the time (30 seconds -> 60 seconds). This is understandable, I wouldn't change that. 2. They don't give vision. Why? Well, it's not like the radius was huge, but I'll accept they don't, just and solely because of support Zyra. 3. They don't reveal an enemy champion stepping on them. That's what I don't get. Why? It's not like it would be an RNG factor type of "fuck you" because you can see the seeds (looking at you, every other trap) and it doesn't do anything other than destroying them. It would just add a decision to the game: Should I step on the seed and destroy it, or is it more valuable for me to stay hidden?

And additionally, Rampant growth (W) seeds only provide vision of an enemy champion for 2 seconds. If I compare: : 9 seconds (WHAT?!) : 4 seconds : 4 seconds : 4 seconds Why all of those last at least double the duration of Zyra's, when they also have negative effect of stepping on them, but only positive when steping on Zyra's seed? If you say Zyra and her Garden of thorns can completely zone you out of an objective, remember me next time you want to gank Teemo or next time you simply just play against Caitlyn.