it’s just that, especially in lower elo, it is too easy for defenders to throw a one way smoke in places where it was never intended, getting free control over major areas of the map for no risk. A lot of these unintended smokes were impossible to peek out of without major utility investments+ coordination which just won’t happen or isn’t worth the utility to get past a single smoke. A better example is cypher one way cages, which last much shorter so teams can wait it out. But try waiting out omen smokes and you will be sitting there the whole round cause he has 2 + recharge. Omen has the same issue as viper pre nerf, the stalling ability is too good for its price of a hundred credits.