That might have been true a decade ago, but no longer. With a bit of practice wiring things async is trivial easy. You have plenty of options now with http2, we

That might have been true a decade ago, but no longer. With a bit of practice wiring things async is trivial easy. You have plenty of options now with http2, web sockets, and SSE. The hardest part, by far, in any of this is certificate management for the mandatory push to TLS for everything. Even that is much easier now with OpenSSL almost everywhere and Let’s Encrypt.