Sometimes choice of technology acts as a signifier. If you're building a startup, and you want to communicate to investors that "hey, we may not have the users

Sometimes choice of technology acts as a signifier. If you're building a startup, and you want to communicate to investors that "hey, we may not have the users yet, but we're built to scale!", Kubernetes and microservice architectures and sophisticated ETL pipelines convey that image better than saying "we've built for the minimal load that we're currently experiencing with a LAMP-based monolith.". The reality may be that your product's consumption patterns will never necessitate having anything more than that, even at a large scale. Your product may be great, you might easily be able to scale manually, but someone who holds the purse strings who knows just enough to be dangerous, might decide that if you're not using the "hot" technologies, you must not know what you're doing.