I'm sure it depends on the complexity of the app you're building. For simple crud-ish apps (ecommerce, online auctions, etc) I've found that I don't need to wri

I'm sure it depends on the complexity of the app you're building. For simple crud-ish apps (ecommerce, online auctions, etc) I've found that I don't need to write even a single line of custom SQL, and performance is generally good (lots of N+1s, but these are easy to avoid with things like bullet). I also love being able to let Rails render most HTML, and the few things that need to be very dynamic you can just throw a single react component in without worrying about the usual SPA problems. If you're just prototyping stuff, I don't think you can beat Rails for productivity. But if you're targeting something more enterprise or large scale, I don't think it's a good choice. Go/Rust are so much faster (not that that matters a lot), and even things like C#/Java pretty nice to use nowadays.