Back issues were cool to me when I was a kid in the 1970s and contemporary comics weren't all that much more sophisticated than old comics. And, again, I was a kid.
I find comics that are more than 15-20 years old to be fun to browse through, for nostalgic purposes, but not more than that. Even New Teen Titans by Wolfman and Perez, the gold standard of DC comics in the mid-80s are unreadable to me for how dated the dialogue is. There are exceptions, of course, but they're the 80s comics that were way ahead of their time (Vertigo, DKR, Watchmen, etc.). But, apart from those, I cringe to read 20 year old comics.
Because I am nostalgic I still love to read about the characters I grew up with. But that's only the case because comics have grown up as I have.
The comics I'm excited to read are the ones that hit the stands each Wednesday. I like to re-read the best DC comics from the last 20 years or so but not nearly as much as I enjoy the new ones.
To me, Denny O'Neil and Neal Adams created the most classic Batman comics but no previous run has been as exciting to me as Tom King's run has. Snyder's/Tynion's JL is just about my favorite JL run. Only Alan Moore's Superman outdoes modern Superman comics for me. And only Johns wrote a better GL or Flash than what we're getting lately.
I'm regularly bummed out by the romanticizing of old DC over contemporary DC. I won't ascribe motives to anyone that prefers the old comics but some here only ever post to complain that things aren't as good as they were in the "good old days."
As far away as I get from appreciating anything from my youth--recognizing that the "good old days" were pretty rotten for most people IRL--I can still appreciate comic books and Wednesday is still my favorite day of the week for that that reason. But I'm only ever truly excited by what's new and what's next.
I can appreciate old comics for the art and for historical context but the writing is horribly dated. I was extremely excited by CoIE when it was coming out and I was 16 but I can't make it through a single issue of that series today.
To each their own though. Not trying to argue I'm right, only that I'm right for me.