The Amiga isn't remembered as a technology. It's the ancestor of "Mac vs PC". It's the little computer that could. Where indies would hack cool stuff. It had a well understood spec that didn't change so much, so you could push the metal to its limit.
It's from a time where if you wanted games and you were a kid, you most likely pirated them. Wanna learn to code? Start messing with your game's files and hex editors. The demoscene was where the cool kids came up with ways to push the limits, beyond commercial software. Beyond that oh so lame Microsoft PC.
It's remembered fondly because it's a way to congregate the people who were there. I never had an Amiga as a kid, my parents had a PC. But I still care about that community. It feels like my people, when I started computers.
Much like music has genres and some might be nostalgic, so does the demoscene. It just doesn't get as many releases as on Spotify.
Respect to all the groups still making content for it. I'll share my favorite recent one, by TheBlackLotus https://youtu.be/W5_NMxW5UfE