DislikedBack in 2006 i worked on the worm project, who's goal was to build a fully automated trading system...we did get it too 87% win/loss ratio but the market exposure at times would require wearing several nappies and like you say there wouldnt have been someone to fire as such.
My own view is that Trading is a profession (that is why professionals are very good at it and large majority of amateurs are not) and like any other profession with EXPERIENCE you get a gut feeling or a sense. This is not unique and is common with almost all professions (e.g. Doctors, lawyers, judges, teachers, etc). Despite Steve`s gallant efforts you can never have a 100% successful EA and you need to baby sit them somewhat.