Diplomacy has changed many times in the past. Why should it stay the same now?
“A new chapter started with a bang. In 1814, the Austrian foreign minister Prince Klemens von Metternich was convinced that diplomacy had to make a fresh start. After the French Revolution and the Napoleonic wars, the old order was clearly over. Leisurely bilateral chats by wig-wearing, white-powdered aristocrats sipping coffee or tea in rococo salons while gently discussing some border issue would no longer do. Napoleon’s conquest of continental Europe had shattered the old balance of power, and a radically new brand of diplomacy was needed, one that was built on the consensus of the European governments.”
https://aeon.co/essays/we-need-a-planetary-system-of-diplomacy-for-the-21st-century