Macca,you make no sense. The analogy between horsepower and beam is dubious at best. In cars the problem has always been getting power to the road. That requires matching engine and chassis. As power increases, chassis are redesigned to accommodate the increase.

The assumption here is that Pete Melvin is at the top of his field and his designs are among the best.

IF: wider beam are always better

Then: Pete Melvin desgins should always have wide beams.

Since the conclusion is demonstrably false, so is the premise.

FWIW, Ferrari doesn't know everything. Their cars don't win all races or sell to all upscale buyers. Iirc, Ferrari was one of the last builders to switch from drum to disc brakes.