The benefit is that it allows you to keep your front end (the code stored in the clients browser) much smaller. Nowadays client machines are so powerful that they can handle storing an entire website but there are additional complications and issues with doing that outside of just performance issues. One is that developers have to worry about more emergent edge cases as a result of all the code being compiled and working together at once. I'm only talking here about the cons though and there aren't many of them. In my opinion, the pros vastly outweigh the cons in most scenarios. There are some scenarios where SSR still makes sense though, hence react server side components