The huge and clear touch screen, the aesthetics and ergonomics, the range of very useful features, it's expansion potential and many do say it sounds incredible... ...Class D streamers and fantastic connectivity are going to appeal to many more people from now on. I know there are many here still hanging onto valves and vinyl, but as I've mentioned before, the world and technology changes and offers new ideas and I've embraced new concepts for decades, working in the IT sector. I still feel people are scared of change and will fight it forever. History has shown us that it's adapt of disappear.
There's some interesting thoughts here. (edit: this turned into a sprawling scatter gun response, a lot of which isn't even related to your post
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I'm impressed with the touch screen operating system. Ever since Tesla, there has been no excuse for any company to ever offer a mid/high range product with a touchscreen that doesn't offer the same experience we feel on our phones/tablets. It pains me that so many new cars & other electronics still have ancient tech that is an absolute pain in the arse to work. Yes, it's either difficult or expensive. Maybe I'm in the minority, but I'd rather they spent cash on an 'OK' app for control over painful touchscreen with terrible software.
On technology & change: what is actually new on the AS520? As far as I understand, it's not adding anything that hasn't been bundled on a streamer before. So they might be packing in more features, and doing it well. But's not new. Mainstream streaming is coming up to 20 years old. Network music playing must have been happening ever since I can remember. Class D is what, 50 years old? And it's always been possible for it to sound just as good as A or B. Reliability has probably been the biggest improvement since MOSFET bought the cost down in the 80s.
That's not meant to be negative. Nothing wrong with adapting & improving. That's how most products make it in the world. Every brand is doing the same.
The psychology is of course bang on. We are adapted as a species to dislike change. Especially when things like class D still have a hangover from the 'budget hifi' label. But what do you think people are scared of? Adapt or die seems v extreme in this situation.
Preferences are completely subjective, and rarely rational. There is a convenience with digital. Speaking for myself, I don't particularly enjoy it. Searching for music on lists reduces my joy of listening to music. I'm 41, had early mp3 players & an ipod. I ripped 600 cds to a hardd drive in 2001. That got corrupted at some years later. I still gravitate to physical music, and I currently see no need for a music server whilst I can stream pretty much what I need from Spotify et al.
One interesting benefit of a 10,000,000,000,000 TB home server is reducing the environmental impact of streaming. Running servers all over the world to allow for our bandwidth addiction is a pretty crazy thing to dive into.
And on software - I tend to find all electronics can be sold/donated for parts once obsolete or broken. Maybe that will reduce the overall longevity of hifi products over time. But I've yet to keep hold of an analogue unit for more than 10 years due to my habit of changing things up regularly.