My gut reaction is to doubt their ability to capture the nuance that goes in to mastering when you account for the intricacies of recording, instrumentation, st

My gut reaction is to doubt their ability to capture the nuance that goes in to mastering when you account for the intricacies of recording, instrumentation, style, etc. But, if you're dealing strictly with synths or something then perhaps this is possible to a degree? Even then a certain amount of the process is just taste.