My SMSL stack stays on 100% of the time. It goes into standby mode which is essentially the same as hitting the power button.
My vintage stack is only when I am using it, although if I am doing something else for a short period I will leave it idle but not more then like 30 minutes.
The main benefit for me was to free up my phone for other uses. But with my current setup there is a large amount of convenience as well, I can cast to it natively from multiple devices and voice commands.
Lossless for me is a must though, I didn’t spend the time I did to build my system to add in a bottleneck in quality via BT.
A Wiim is basically the same cost as the Emotiva BTR-1, I can’t see why anyone would choose the the Emotiva.