If he doesn't demand a strict watertight prenuptial, then neither is she.
He's under Markle's thumb and I bet she's the one who threw a fit about it.
Your assertion that marrying without a prenuptial is foolhardy is debatable. The famed American divorce attorney Marvin Mitchelson has said that he has never seen a marriage begun with a prenuptial NOT end in divorce. If you pledge yourself to someone “for better or worse”, yet already have divided up the spoils e”just in case it all falls apart”...you are not really getting married. This is ESPECIALLY the case when the people getting married have no children and hope to have children together. Harry and Megan have a better shot of remaining together for the long haul because they ignored all the cynics and lawyers.