Does loudness play a part in your appreciation?

It's a great question actually. I've wondered about this myself some lately.  

A friend and I were comparing listening sessions recently and I realized we like to listen at different volume levels. And, thoughts around how each of our systems will sound different if he's listening at 80db and I'm listening at 70db most of the time.  

My system's character changes overall when comparing 65,70,75,80-85db listening levels. I don't care for how my current system sounds when the volume level is turned up really loud. My level of interest and engagement drops notably.

With or without my hearing aids?

As others have indicated, 70-75 db at my listening position is a good range to comfortably enjoy the hi-fidelity of my system without stress. Above 80 db starts to get uncomfortable.  

With my Tube Raven Audio Reflection and having tinnitus and playing at 65 db I hear the ringing and the music and yet if I really really pay attention you still hear detail that is different than say 75db which is loudest I play...At 75db OMG the sound god comes alive and at times No Ringing and just music and the tubes just dissect the music into 3D sound stage and I am fully engaged into it until a moment I think about my ringing tinnitus and then I hear both ..But during that time of silent ringing is a moment of listening to music that makes me feeling  relaxed..

Higher volumes can make things more involving, yes. Depending on the components in the system (I switch things around), they need more ooomph to get momentum, come into balance.

Regarding the idea that 70 db is loud, here’s a chart:

Environmental Noise

0dB   Weakest sound heard

30dB  Whisper Quiet Library at 6’

60-65dB Normal conversation at 3’

80dB  Telephone dial tone

85dB  City Traffic (inside 1  car)   

Sound Levels of Music

60 -70dB Normal piano practice

70dB    Fortissimo Singer, 3’

75 - 85dB Chamber music, small auditorium

84 - 103dB Piano Fortissimo

82 - 92dB  Violin

85 -111dB Cello

95-112dB Oboe

92 -103dB Flute

90 -106dB Piccolo

85 - 114dB Clarinet

90 - 106dB French horn

85 - 114dB Trombone

106dB   Tympani & bass drum

94dB    Walkman on 5/10

120 - 137dB Symphonic music peak

120dB   Amplifier, rock, 4-6’

150dB   Rock music peak

https://www.gcaudio.com/tips-tricks/decibel-loudness-comparison-chart/