In my country, almost anyone producing lots of very similar homes builds chooses a reasonably attractive design for the simple reason that attractive buildings can command higher prices.
Of course, as they want to be attractive to as many potential buyers as possible, the results do turn out kinda neutral.
More than that, most of what makes a design attractive doesn't cost any more than unattractive and so there is no cost. Often attractive is cheaper because a factory knowing attractive features are in demand will setup jigs/machine to automatically cut the profile into a board while if you wanted a something plane it has to be cut but hand.
Of course, as they want to be attractive to as many potential buyers as possible, the results do turn out kinda neutral.