Originally Posted by selig
Muting/Soloing both does nothing different than muting/soloing one - why would this be an advantage?
The advantage is that you can mute / unmute in the window you're in instead of having to hunt down the place where the sound is muted.
Say you have three monitors - rack, sequencer, mixer. You mute a track while you're working in the sequencer view, change a few things, then head over to the mixer to adjust levels. If you want to hear the muted track right now you have to interrupt the flow of your work and go back over to the sequencer screen.
With them linked in preference you can mute and unmute in whatever window you're working in - you keep working instead of hunting down the original mute.
The way it's set up right now is like a three way light switch where you can turn off the light at either switch, but if you want to turn the light back on you have to waste your time and walk back over to the other switch.
A simple preference tickbox for this would harm no one that does it the original way but would benefit those who don't want to deal with multiple muting permutations.