When Stéphane Rinderknech was named chairman and chief executive of the perfumes and cosmetics division at LVMH in March, it was an expected appointment. Rinderknech joined the French luxury group a year earlier ostensibly to lead its hospitality division, but the executive was a beauty veteran, having spent 18 years in senior roles at L’Oréal. To say his departure was a blow to the world’s biggest beauty company is an understatement:…