I'd also argue that an uncontroversial definition for 'good design' would be design that functions best for the majority of users. That somewhat explains the t

I'd also argue that an uncontroversial definition for 'good design' would be design that functions best for the majority of users. That somewhat explains the trends you see in design, because when we employ a convergent design standard, it's more readily accessible in a single visit than a design that breaks away from current conventions. It's also empirically the case that the convergent design standards represent the 'fittest'. And I would argue that evolutionary speaking they represent 'good design' (that's my definition anyway).