It isn't.<p>First, Rails is slow. I've never used a Rails-based app and thought "wow, this is fast".<p>Second, you probably don't want to use Rails to build your front-end. We've come a long way and there are way better front-end tools to use.<p>Third, because of the second point, you need a developer who knows Javscript/Typescript, and Rails. This is harder to find than just someone who knows Typescript.<p>Fourth, it's easier to find talent by not using Rails.<p>There are real reasons why Node.js overtook Rails and they haven't changed in 2024.