the Art Ross by a lot
voters ruin the credibility of the Hart both via the silly playoff stuff and due to having a heavy forward bias in general
the Lindsay is also both a subjective award that's voted on(although at least there's less stupid team stuff going on in that one) that also has a very heavy forward bias
the Conn Smythe is ruined both by voters and by the very nature of the award meaning most players flat out not even being considered either via not making the Playoffs or their team not winning the cup through no fault of their own(with even someone like say Karlsson last year flat out having 0 percent chance of winning no matter how good their Playoffs were just because their team didn't make the finals)
the Vezina and Norris have that whole voter subjectivity thing going on as well
the Richard isn't bad but it's a lot tougher and more prestigious to lead the league in goals than it is points and it's also a lot easier for the goal race to be heavily influenced by stuff like someone having an abnormally high shooting percentage that year(luck essentially)
Historically, the Lindsay has been so heavily biased toward forwards that it kept it to overcome the Hart in my opinion. In nearly 50 years only 4 defensemen and goalies combined have won it. There's no way the most outstanding player isn't a forward only barely 10% of the time. There's no way Bobby Orr was that player only once.
That said the winners have got it right in recent years (2010, 2013, 2018).
the Hart is extremely forward biased as well though
in the past 45 seasons a non forward has only won it 5 times and two of those were Hasek at his best in fact the only difference between the two since Bobby Orr is that Theodore and Pronger a Hart but not a Lindsay and vice versa for Mike Liut(and it's about more than just the winners as well,for example if you look at the voting results for this year the top
11 vote getters were all forwards)