Sorry, I wasn't saying you should split, I wanted to say that depending on what type of apps you are more leaning into one makes a bit more sense than the other. Render with their own CDN is quite good for frontend apps. In comparison, the whole config and auto scalling/provisioning of Railway makes it easier for backend app.
Of course you can do both with both of these services.
Of course you can do both with both of these services.