This isn't a huge thing for me, sometimes players are just so eager to act before the dealer is done scooping bets it gets missed. It's not too hard to find the action if one has briefly lost track of it.
It becomes a problem if it happens regularly (as it does much too often in one of the private games I play in).
When you check — unless trapping — this typically shows weakness. Someone checking would rather it go barely noticed so the remaining players don’t think about it too much.
In games where many amateurs are inattentive, a double-check helps the bad players. Some of them barely recall who is in the hand, so a quick check may not even be registered.
If you have to check twice, it is more likely that almost everyone will take notice.
This is a huge one, and my understanding this is the one thing a dealer will automatically be "written up" for in a casino. That said, if a dealer is trained in good procedure, raps the table before burning, there is plenty of time to prevent premature burn and turn.
I was playing in someone else’s home game the other night. There was a rotation of three dealers. I was in two hands where the worst dealer flipped over the turn with a player yet to act. Very annoying. I have mentioned to the host that this particular guy makes a ton of mistakes, and he is going to use him less in the future. But it’s not easy finding three dealers every week.
Any dealer that has been in a training course I assume would be above these issues.
If they are a good learner, sure… I see it far too much.
This is a gray area, and as host you may have to make a decision on this. Dealers in casinos are never the final decision makers, they can point out little things, but if there's a dispute it escalates to a floor for a final decision. As host do you stand in for the floor here or are dealers empowered to make the final decision?
I’d say it’s kind of a two-tiered thing.
I expect a dealer to handle the small routine stuff including basic rule enforcement (e.g. no talking about the hand multi-way, showing cards to a neighbor, etc.).
If there is an unusual situation which truly requires a ruling, I am in effect the floor, and need to be the final arbiter as the game’s host.
But my dealer is as knowledgeable as me or moreso about rules (former casino guy). So I’m going to take his input seriously.