Good riddance then to the silver age comparisons!
Regarding omissions, it's a very DC-centric list. Overwhelmingly. Sure, DC is a golden age juggernaut, but 80% of the list? And all of Tier 3?
Pep 22 has rightly been discussed.
Whiz 2 has also been addressed, rightly so, but what about Captain Marvel Adventures 1? Used to be a top 20 book. It has certainly fallen from grace.
Red Raven 1? Is that once-hallowed Kirby one-shot now less appreciated than every pre-Robin TEC?
What about Planet 1, Jumbo 1, Jungle 1 - all long-running, and don't underestimate the importance of Sheena!
Submariner 1? Human Torch 2(1)? Both less desirable now than all those Tec's or the first appearance of that favored of heroes, the Sandman?
Police Comics 1?
I think my biggest question at this point is whether this is somehow intentionally a list of superhero comics. Looking back a few decades, I can't imagine such a list without WDCS 1 as well as FC's 4, 9, and 16! If they've fallen that far out of favor, so be it. I guess I need to retreat back to my cave...