What I miss and that is mostly gone forever is the stereo equipment from that era. Those stacks of components with their flickering analog meters or later the digital graphs. And it was just cool.
This cool stuff is not gone. You just don’t see it much anymore because it doesn’t pass WAF. (wife acceptance factor) Large speakers normally don’t fit into their décor. My wife said the same thing. “There is no way you are putting that big ugly box in the living room!” The nice thing about DIY is you can easily hide speakers. I have x9 12” woofers under my couch. No one knows they are there until I turn the system on. DIY can be very inexpensive. The 12” were only $30 each.