Also, embedded servers are now much much much more popular. Stuff an HTTP server directly into your application and do whatever you gotta do without gateways.
But even if you disagree with me the point is that I can count on only one hand the number of times I went "oh man, I need a FastCGI middle end".
F.E. Python stdlib http.server comes with a warning: Warning http.server is not recommended for production. It only implements basic security checks.
The `standard` way is then to use WSGI or ASGI, not FastCGI, but it is similar interface implementation.