[notatoad]

>If you only care about events in one direction, it's a perfectly fine solution

i feel like clients sending requests to servers is a pretty well-solved problem with regular http? i can't imagine how that could be the difficult part of the equation.

[nitely]

not if you need bidirectional communication, for example a ping-pong of request/response. That is solved with WS, but hard to do with SSE+requests. The client requests may not even hit the same SSE server depending on your setup. There are workarounds obviously, but it complicates things.