Only 1 defenseman has been on the ice for more PK goals against than Holl, so it's unlikely they value his amazing penalty killing ability.
I like Holl more than most, but it's just idiotic to keep forcing him into games. He's playing badly, he should be able to sit out
He's not playing nearly bad enough to put Kral or Mete in 20 minute a night role with heavy PK minutes.
It is kind of funny on how much he gets crapped on. Out of the top 70 guys in terms of ES minutes right now (aka the top pairing guys), he has the 12th best GA/60 and is 48th in xGA/60 at ES. Not bringing much offensively but not really his job anyways. Even comparing him to the best of the best, he is still just barely below average in terms of expectation and is near the top in terms of actual goals against.
PK has been a bit rougher for him early on, but 8 games is not enough to go from a guy with a large sample size of excellent play on the PK to a pair of guys with extremely limited PK experience in the NHL. Has also made some rough plays at times with the puck on his stick, but hardly anything that has hurt him alone.