Is louder better?

If your system lack details at low volume it is because probably one of the three embeddings is not under controls....

Too much vibrations..

Too high noise floor level in the electrical grid...

Lack of acoustical control....

Or very bad gear....

No, it's just louder, that's all. 

Yes, the morning hours is when electric is cleanest, and the quiet is deafeningly awesome for audio listening. 
   Love listening critically from about 12-4 am. 

Yup! late night low level is just the best!

I think louder is better (depending on circumstances). If I'm cleaning my house, I don't need to hear J.S. Bach at tremendous levels.
If I'm wasted (a quarterly event) listening to LZ or Jimi, and feel like cranking it, I don't want the system to wimp out or fall apart.
This is how to tell if you got your money's worth.
All systems, MOL, sound good at moderate levels. You pay the big-bucks for something that sounds the same at whatever level you choose.
This is, to a large extent, dependent on room size. Blasting music in a small room can't help but trigger all kinds of foul resonances and reflections. My dream room is 30 X 50 X 12. Peace