First off, alot of companies don't have caching layer. It's not different languages, it's the fact that you have really capable webserver underneath. It's HAProxy -> Apache -> PHP vs HAProxy -> Golang (Net/HTTP) or HAProxy -> Python (Uvicorn) with a lot less knobs to manipulate.

I'm Ops person who has supported larger PHP applications. I've had several outages because PHP developer dropped some Apache config to "fix" something that caused HAProxy to disconnect. I've almost never had this with Uvicorn or Net/HTTP.