> React How come that FB is inventing the most sophisticated, cutting-edge web technologies, but at the same time their core products (Facebook app, Messenger &

> React How come that FB is inventing the most sophisticated, cutting-edge web technologies, but at the same time their core products (Facebook app, Messenger & Instagram) are an absolute mess both in terms of performance and usability, not to mention a ton of bugs that haven't been fixed for years?