On his point about payment gateways possibly being better for Rust I currently work in a system with a <10s SLA for a payment flow and boring old Java works fin

On his point about payment gateways possibly being better for Rust I currently work in a system with a <10s SLA for a payment flow and boring old Java works fine with the whole Kafka/OpenShift/Microservice craze setup. And this setup runs through a bunch of microservices and talks to external API's. And even the real time messaging stuff? It probably depends on how real time you need, e.g WhatsApp is heavy on Elixir I believe and is the better choice for real time messaging due to its amazing actor concurrency model. Rust is a niche language for most programming domains imo but when you have a use case it really shines. But it also is such an attractive language because it brings out the engineer in all of us. The addicting process of optimizing every bit of code when in reality you probably should of just spun up a Rails app for your service and scaled horizontally eating your sadness of the performance engineer within yourself over the business logic that needs to get done yesterday.