"Installing a six burner cooktop, will send men rushing into the kitchen!"
Mostly meant to address symmetry issues, besides maximizing utility. However, a six burner cooktop needs to be examined from the practical aspects of using all six burners simultaneously, which may require a mix of big and small utensils to avoid space constraints. 
Thus, in most cases, capability of using all burners is an illusion if expecting to utilize simultaneously. However, in assessing a particular six burner cooktop brand, if the heating capabilities are highly specialized and differentiated, a six burner cooktop does indeed make sense.
An assessment on these parameters is best done through reviews, which alone can be expected to provide relevant information on a particular brand or make while also supplying credibility to manufacturer's claims. Catering to commercial and or the high end market,
