To me, I only consider it secondary because it's easier to win while not being among the very best players for the season, which was the case with Ovechkin for a couple of his wins, Cheechoo, Nash, and Hejduk. And going back to goal leaders before the award, Tkachuk, Bondra, Stoughton, Gare, Simmer, Shutt, Leach, etc. I'll see Washington fans use trophy counting in arguments for Ovechkin over Crosby, but there's some years where he won the Richard, Crosby won nothing, and yet Sid was the better player. That doesn't really happen with the Hart, Lindsay or Ross very often.
The list of goal scorers is actually very prestigious.
Excluding Matthews and Pastrnak (too early to say), 93 of the 111 goal scoring leaders since 1918 are or will go on to the hall of fame (assuming Ovechkin, Crosby and Stamkos are in, and Kovalchuk and Perry stay out). Of the 102 seasons excluding the most recent, 93 of those seasons will see the goal scoring leader for that year go into the hall of fame. That’s 91% of all seasons.
Those names you listed above are basically the only outliers of non-greats in NHL history. The “etc” you’ve used is misleading because there are only about 3-4 more names you could include as non-greats since 1918. You might as well have listed them all.
Here are some prominent goal scoring leaders from the 50 years before the Rocket was introduced in 1999:
Maurice Richard (3)
Gordie Howe (5)
Jean Beliveau (2)
Bobby Hull (7)
Phil Esposito (6)
Guy Lafleur (1)
Mike Bossy (2)
Wayne Gretzky (5)
Jari Kurri (1)
Mario Lemieux (3)
Brett Hull (3)
Teemu Selanne (2)
Pavel Bure (1)
Thats 41 all-time greats leading in goals over the 50 years from 1949-1998. And that doesn’t even include Sid Abel, Bernie Geoffrion, Dickie Moore, Norm Ullman.
And then post-1999, you have more Selanne, more Bure, and Ovechkin, Crosby, Stamkos and Matthews. The only real down period for goal scorers was 2002-2007, part of which coincided with the worst collection of offensive superstars in modern NHL history. Which just so happened to occur at the same time the Rocket trophy was officially introduced.
The best players in NHL history will most likely need to win at least one Rocket in their career, just as their predecessors led in goals pre-1999. The list of all-time greats without a Rocket or retro-Rocket is tiny- Mikita, Trottier and Clarke basically complete the list of exceptions until the 1990’s.
The Art Ross and Hart is above the Rocket, but the Rocket is still a primary award. For forwards, I consider the Big 3 awards to be the Art Ross, Hart and Rocket. The Lindsay has an impressive list of names too, but I don’t see the purpose of that award, as it’s simply a less prestigious and less historical duplicate of the Hart. But I can still see the Lindsay as a nice “notch on your belt”.
The Selke is nice too, but is below the others and works best as a side-addendum to one of the other Big 3 (or big 4): Art Ross, Hart, Rocket, Lindsay. The Selke winners we hold in highest regard are those that won another major award because of their offense (Clarke, Fedorov) or were at least capable of doing so (Yzerman, Gilmour, Francis, Datsyuk).