No true stealth detection breaks certain champs.
Vayne end game, Akali during mid. The ones that could be geniounly countered cant be countered anymore late game.
A fix could be : Abilities that hit the stealthed enemy reveal target for 1.5 seconds. Or upgrade the oracle lens cause it's useless at what it's supposed to do, seeing a particle where the stealthed champ is means nothing in a teamfight. Be real. :P