Frankly, the only joke here is that Karlsson is "overwhelmingly" the best defenseman in the league. There's a tier that he's in that several other defensemen are in. If you need a list, you have the blinders on.
Karlsson right now is on a tier similar to Bourque from 82-95. He is the defacto best defenceman in the NHL. Other defencemen can still win a Norris but they need to do something really special to do so. Like Coffey, Langway, Leetch or Chelios did when Bourque was generally considered the best overall defenceman.
Right now Karlsson gets discussed as one of the top few players in the world. With McDavid and Crosby. The fact he was runner up for the Norris the last two years doesn't bother me very much as a Sens fan. After the playoffs Karlsson is finally getting the recognition he deserves.
I thought Doughty was a poor choice when Karlsson led the NHL in assists but whatever. Burns had a remarkable season and him winning the Norris is fine to me. He really did have an all-time memorable season.
Barring injuries I expect Karlsson to be a first or second team all-star and Norris finalist for the next decade. He will win 3/4/5 more Norris trophies and be remembered as this eras "Bourque, Potvin, Lidstrom, Harvey" and be regarded as the defacto top defenceman for a dozen years. Several 2nd place finishes won't matter to his legacy and will add to it.
Karlsson 2 wins 2 second place
Potvin 3 wins 2 second 1 third
Bourque 5 wins 6 second 4 third
Lidstrom 7 wins 3 second 1 third
Karlsson will likely have 8-10 top 3 Norris finishes by the time he retires, if not more.
Pretty much all the doubters about Karlsson have given up on that train of thought. He is unique and now has a defensive resume and a playoff resume and a best on best resume that shows he is the best defenceman in the world... and with that hindsight has likely been the best D in the world since 2011/12.
The people who said he was a 4th forward or an offenceman or soft or too small have seen all those criticisms become just silliness.