[Rail Jon Rogut]

You can assign what the Master Fader is the Master of.. but you can't assign the Master to another buss or output which could have another Master Fader.. 'cause then the original fader wouldn't be a Master (but a sub-master)... which gets to why I said "by definition".

The resolution is also dropped from 32 bit floating point to the session resolution after the Master output fader.. feeding that back into another output fader would cause all kinds of issues.

Rail