Just curious, did you grow up in the 80s or are you a bit younger? I don't ask that in any sort of adversarial way, I'm merely trying to get a sense of your perspective.
I grew up in the 80s, so no, I don't look at these bands as oldtimer bands. However, I do remember that I felt something was missing from the music of the 80s. When the power and prog bands started to show up on the scene in the late 90s, they hit the spot. The music was faster, more orchestrated, more complex, even more catchy at times.
Having grown up in the 90s I, for whatever reason, struggle to connect with a lot of older releases. I can acknowledge them for their impact, influence, contribution etc. but I still struggle to get into them. I'm often more successful at getting into current bands for whatever reason.
I have a hard time getting into older music as well nowadays, and I'm not really alone. A lot of people don't listen to metal at all anymore because it just got so tired. Most of them found other things to interest them. I just found newer metal which I feel leaves 90% of 80s metal in the dust, quality-wise.
My whole thing with comparing a band like Maiden to modern powermetal bands, and why I still prefer Maiden, is because much of modern powermetal suffers from the same problem much of modern rock suffers from; theres no "edge" to it. Rock/metal used to be rebellious, angry music that you could scare your grandmother with. I don't hear that when I listen to, say, Holy Land. But I do when I listen to Killers or Number of the Beast.
Well, I approached metal differently as a kid and I approach it the same way today. It's all about the melodies and arrangements and the power. The melodies are better today, the arrangements more complex, and due to better production and technology, more powerful-sounding. So I can at least explain logically why I prefer today's metal, just as you explained logically why you prefer the metal of the past.