Adamatium can be broken like wolverine claw but Kara skin wasn't penetrated till now unless it alien technology designed for kryptonian or kryptonite .
U can't assume that Phoenix can disintegrate any thing when she wasn't able to damage something.
Phoenix killed Charles in her house and she tried to disintegrate wolverine but his healing factor saved him. she would have killed x men if they were in her range but they evacuated most of them only wolverine went back.
They were in range. Wolverine survived via plot, it is obvious, except for you. Apoc had the healing factor too, plus a celestial armor and he got stomped by a rookie Jean. Being atomized has nothing to do with skin toughness. You just want this team to get top over someone who is leagues above them for some reason.