And while they're doing that, they've turned the original superhero, inspiration for most of the Silver Age...into an undead zombie.
Um, in case you missed our point: Earth-2 Superman != "the original superhero, inspiration for most of the Silver Age". How does one inspire something when the character's concept came after it?
Maybe you'll understand when I ask you to pinpoint exactly when the comics stopped showing "Earth-2" and started showing "Earth-1".
As to your general point: Maybe, just maybe, they're not the blind devotees to the Silver Age as scans_daily would like to think? Maybe... y'know, they just like aspects of it and not the whole shebang? But I guess painting with broad bushes is easy.