> Do we really need event-driven architecture, serverless functions, hundreds of micro-services for a web application that barely have 1k concurrent users This

> Do we really need event-driven architecture, serverless functions, hundreds of micro-services for a web application that barely have 1k concurrent users This is verbatim the thinking that led to needless overengineering - focusing on number of concurrent users as the only requirement and metric of success. You may require event-driven architectures, serverless functions, etc to meet business requirements, regardless of how many concurrent users you have.