[Snake]

Some of the status effects listed in Obscure are quite 'way too easy' to re-apply and often are no 'waste of Momentum' for the enemy, as they come along with a boat load of damage, and that's why immunity is needed, exactly as MegaBlues said.

At least Marked For Death, Hunted, Glowing and Analyze Weakness, may need an immunity of 2-3 rounds, whenever you use Obscure.

Other statuses, such as Watchful Eye, Claret Call and Enemy Evaluation are quite harmless and situational, and sometimes come without damage being done by the enemy, or simply are the bread and butter of a whole class (Claret Call for Ghosts).