Eh, I call it as I see it. Only about 50% of the NHL games I watch involve the Bruins so I see plenty of other star players. My analysis, for better or worse, is what it is.
Most of what we're talking about here is not quantifiable statistically, but Pasta does turnover the puck a lot. Amongst forwards, he ranks 5th in the league for average number of giveaways per game since the start of the 2020-21 season. You're right, star players have a higher risk-reward threshold for their play, and that inevitably results in lots of giveaways - the players above Pasta in giveaways are Jack Hughes, Draisaitl, Malkin and Marner, and Matthew Tkachuk, Kucherov and McDavid aren't far behind. And all the best players still make their share of mistakes, even really silly ones. Pasta is not exceptional in either case.
But still, I see Pastrnak as unique in just how bad be can look out there sometimes. Part of it is largely appearance - he's not a strong skater by NHL standards, and he can sometimes tend to look sketchy, unbalanced and too easy to beat or knock off pucks as a result. But much of the time when he looks disjointed and lackadaisical it doesn't mean that he actually is, or that he's not being effective. It's kind of just his style. However beyond that there are genuinely are plays he makes that can only be described as brain-dead. Really baffling stuff that would embarrass a first-year rookie, and some things that simply look - and the key word again is look - lazy. I don't think he's actually lazy, it's just not in his nature. I think it's more a product of his hands working faster than his mind such that you get situations where better/smarter options are available but he hasn't had time to process them and pure instinct doesn't always fill the void.
He's a terrific player. He's going to get $10+ mil p.a. and he'll be worth it. I don't think his bad play is in reality any more damaging than anyone else - his mistakes don't hurt his team any more than any other top-tier forward. But my view of him remains that I'm not aware of another player who quite has the ability he does to look so good and so ordinary, sometimes in the space of the same shift. There's something about him, something almost mercurial I guess you'd call it, that's unmistakable for any other player. It's not really a criticism, more an observation or perception, and while some of his individual plays can frustrate me, I take the whole package for what it is and it's great. There are things he can work on and hopefully continue to improve, for sure, but if any of the fundamentals changed he would not be the unique athlete and person that he is.