What are the problems that haven't been solved? Stateless application servers have been reasonably commonplace for years, now, which is the main hurdle that I'v

What are the problems that haven't been solved? Stateless application servers have been reasonably commonplace for years, now, which is the main hurdle that I've needed to surmount. The majority of other issues can be handled at the platform level. It's a lot of work to refactor an application, and sometimes that doesn't make sense, but a blanket dismissal of the usefulness of proper architecture because an application isn't running at Google or Facebook's scale does little to help push technology and practices forward.