I'm not sure about others, but personally there is NEVER a case when I want to monitor multiple software instruments at once. If I want to track multiple tracks as one instruments, I have much better ways to accomplish that. I could group the instruments together or create a combined instrument patch and control both vst instruments within the same track.
Does Studio One have a way to make solo monitor on track selection the default behavior? Opening the track, expanding the inspector, and option-clicking the monitor button is getting annoying and inhibiting creative flow - I want monitor a track in one click, not three clicks...please :)