Aside of thinking that W&K genuinely love each other, and H&M not, I think it was a smart choice of W&K not to show PDA in official engagements. Being ‘neutral and professional’ in public makes it harder for the press to speculate about their relationships. But H&M are always glue to each other, so of course when they don’t, people and press 1) give excuses explaining why 2) speculate about problems in heaven. And people will start to notice when things go wrong. Not a very smart move, imo.