I mention it because Interject has a cooldown. Dodging does not.
If you could literally just sidestep the attack to fully nullify it, why would use on it a CD that could instead stop the boss from, say, AoEing the whole party or getting 15% more HP via Stoneskin?
By not just moving three feet over, the fight has gone on longer because you wasted a tool that could have otherwise shortened it.
