If a brand/manufacturer would tell/advise me that their products need to be on 24/7 to work properly and according to specifications, I would simply NOT buy their products.
Besides energy waste and higher bills for me, things I don´t like, what they(the brand/manufacturer) actually are saying is "Our products are not properly designed" "Our products are actually not very good".
What are you talking about? there are very very few devices that actually truly shut down these days.
Devices from companies like Naim and Bluesound/sonos often don’t have a traditional “off” switch, but that doesn’t mean they’re poorly designed. Instead, they enter a low-power mode (not really standby), similar to the phone in your pocket. Your phone isn’t fully off, it’s just sleeping, staying connected and ready to wake instantly when you need it, when was the last time you completely powered down your phone? Does that mean it’s badly designed? you phone will die becasue of planned obsolesce before it dies of machcanical failure. Same for a todays tvs they do alot of there updates while you think there "off". Heck your fridge works this way!
Hi-fi equipment works in much the same way. Keeping circuits gently powered helps maintain a stable temperature helping to avoid electrical stress caused by repeatedly powering on from cold, which can wear components over time. In this "standby" state, the device uses only a small amount of power while remaining ready to perform at its best. If an electrical device is going to fail it will be at most unstable stage.
This approach is a deliberate design choice that balances performance, longevity, and convenience. Rather than shutting down completely, the equipment stays quietly “awake” so you don’t have to wait for it to warm up or reboot.
When manufacturers recommend servicing every 10 years, it’s simply a routine inspection and clean, not necessarily a repair or parts replacement unless something actually needs attention. The most important take away, its a recommendation not a MUST.