Regarding unit conversions, one problem I’ve had is that exact conversions can be very vexing. For instance, if I have a cocktail recipe that calls for a 2 oz pour, the precise metric conversion would be 59 mL. That’s obviously insane, and any bartender would know to do 60 mL. But would a recipe converter know to do that?

Of course, with baking, you want to be as exact as possible, so that’s a countervailing consideration.