Reminds of the C750 and Premier 1.... long before structural issues became a concern, Vmo was set as a speed where the pilot could still control the left turning tendencies at high speeds.
Reminds also of an Ex-Eastern captain trying to convince me that a Citation 550 could get into 'coffin corner'...I said no....'I have more wing then engine'...I don't think he knew what I was talking about...