The changes we need in vision
First off, having only control ward is bullshit.
It is absolutely useless against stealth champions, but is completely broken against traps such as
shrooms because it completely invalidates the point of the champion. Completely unbalanced and biased.
It should not do that. It should reveal traps, but not desactivate them.
Then, we need an item in the form of a ward or sweeper that reveals invisible champions. Not just show an untargetable image of them so that you can see your death by insane bursts Kha'Zix or Vayne for instance, because who cares we see where they are when the whole purpose of their stealth is temporizing for their burst to come back on (and yeah, Vayne is now a burst assassin on top of being a kite-based tankmelter duellist, deal with it) ; but completely revealing them so that you can target them with spells and autoattacks.
This should be also available in trinkets.** And the only thing it does is revealing champions, not wards, traps or anything else**; which makes it extremely weak in the map vision domain, therefore balancing it fairly with the other choices of trinkets.