The thing is how do you qualify what constitutes as a high danger/unforced turnover? Someone like Jumbo Joe makes a lot of those "unforced giveaways" because he was trying to go for a play normal players couldn't even think of to make something happen out of nothing. If it works, magic. If it doesn't it turns up on the wrong side of the stat sheet.
Oh I admit it's a generalization, of course there's exceptions. And that's the thing, they're exceptions and you have to know what you're looking for be able to pick out the needles in the haystacks. For instance Milan Lucic is the worst forward in the top 60 in giveaways by a country mile, and you can tell because he isn't a primary puck carrier or high end playmaker. Players like Crosby/Tavares/Hall/Marchand/Gaudreau etc are constantly among league leaders in giveaways and you'd have to be high to think they're bad players. On the flipside Mark Giordano is constantly among the league leaders in blocked shots because he plays a stupid amount of short handed minutes (like 3 minutes+ per game) in which you basically have to concede possession and deal with opposing shots by any means possible. Players like Russell/Girardi/Ceci/Orpik/Stone etc are complete tire fires in their own end and bleed chances against like crazy.
Obviously you don't actively look for forwards with high giveaway totals or actively avoid defensemen with high blocked shots totals without evaluating the "WHY" for those stats. In this case, it doesn't take a genius to know Crosby/Tavares/Hall/Marchand/Gaudreau are excellent players and Lucic is one of the worst players in the NHL. Similarly, it doesn't take a savant to figure out Giordano is an fantastic defender and Russell/Girardi/Ceci/Orpik/Stone suck the big skin banana.
As I said, blue line turnovers are considered a high danger turnover as your team is heading in one direction in an area that will cause an odd man situation towards your defensive zone and usually an immediate scoring chance for the opposition. An unforced giveaway is where a pass, usually a blind pass, is given to an opponent without a challenge for the puck. It is pretty simple and is subjective, and will be used by coaching staffs as we did.
Bottom line is when I coached, it was a useful stat that players understood and could directly control. Elite level players down to slugs should not be turning the puck over at the blue lines creating high danger chances the other way, again blue line turnovers which create immediate scoring chances for the opponent, and unforced turnovers no matter the skill level are exactly the same. With elite players, they usually make few high danger turnovers and unforced giveaways.
Lucic this year has been a disaster at unforced giveaways and I would not be surprised if he were the worst on the team. Blue line turnovers Draisatl has some issues with but that can be fixed, and as said, McDavid has a high percentage of controlled zone entries, he rarely gets caught turning it over with a scoring chance coming the other way despite him having clear possession of the puck for huge amounts of time.