Thats not the point – in my mind!
If I use a 16-channel player I will bring this 16 channels to the mixer to play the missing parts in my performance.
The basic of this 16 tracks are my backing track concept wich was produced on my DAW. If I have finished this tracks they are already mixed. There is no need to bring them to -12dB. It is only extra work.
For using on the mixing console it is a bad thing to push them up to +12dB.
All tracks I am using AND all tracks I get from other musicians and studios are leveled at 0dB.
I think that the -12dB is for most users less practically.
Why it is not adjustable in the settings?