Centaurus
I've never had any incident or problem with manual throttle go-arounds, using the straight arm thrust setting technique. My argument for leaving the autothrottle armed for go-around is one based on enhanced capacity for the pilot, not that the pilot is assumed to be incapable of setting thrust manually.
I find your assumption that I require further simulator training in these methods both presumptious and offensive. It has always been my preferred operating method to give each of my colleagues the benefit of the doubt in their hand flying skills; sadly it would seem many contributors to this thread hold an extreme prejudice that anyone who maximises automation must have crap manual skills.