When you start to scale for your amount of customers and features, you have to manage caching, job queues, and more. Things frameworks like Rails or Django provide mostly OOB. If you’re using Go or Node, you’ll end up writing your own de-facto framework (even if “writing” means pulling in different libraries and gluing them together) around those features, especially in the case of micro services where you’ll want each of those things available in each service.