I think preference should be given to athletes to be as comfortable as they can in any competition. When athletes enter the arena in the best frame of mind, they are bound to give superior performances, which are the main reason for the prestige of any event.
Provided an athlete’s routine is not grossly disrespectful of the basic moral code, e.g. inappropriate gestures or violation of peoples’ basic human rights, they should be allowed to indulge in their preferred pre-match routine.
That said, Martina fully exercised her right to freedom of speech when she aired her view. In my opinion, I think it was a clever way of initiating a conversation that will get attention from a more pertinent issue e.g one concerning her skill, performance or composure.