I know it sounds dumb to be random internet person sitting here saying "yeah well sometimes coaches are wrong" but it IS something that we see again and again in this league and in pro sports in general. Coaches, GMs, etc, are often wrong about players that may have a game that's a little different than the mindset that the coaches have.
I think DeAngelo is not given any slack for how he plays...he makes a mistake it's a BIG DEAL. If Marc Staal, Brendan Smith, Brady Skjei, Neil Pionk, Adam McQuaid ll make a mistake, it's OK look how much effort they give. If Pavel Buchnevich glides on the ice here and there he's a lazy POS who isn't engaged without the puck and should be moved down the lineup or scratched even if he likely could put up 50+ points given top six minutes, but Jimmy Vesey man have you seen how that guy hustles even if he is mediocre as all hell at scoring goals and his defense isn't anything to write home about?
If we're going to be a grind it out dump the puck be afraid to make a single mistake "no talent" style of team then let's hurry up and trade DeAngelo, Buchnevich, Chytil, Kravtsov, etc. Demanding that your most talented rookie players be near perfect and make no mistakes is a good way to Sanguinetti them all
IDGAF if DeAngelo makes some defensive zone mistakes if he spends more time attacking, generating scoring chances, putting up points, etc. I'd rather a couple of mistakes than watch the rest of the D chase their tails in their own end, fail to break the puck out, and just end up spending all their time defending even if they "do it well".
I dunno, I'm getting grumpy about this. He's never going to be perfect in his own zone, but he's shown he is an effective puck mover who generates chances and the points have also started coming for him this season. If this team wants to develop an offensive defenseman, well here he is.