Should I turn on Wi-Fi calling on my iphone

Good

If your cellular provider offers it (not all do), I can't imagine why you wouldn't have already turned it on. It's a nice convenience and lets you make calls over Wifi, if you are located somewhere where cellular service isn't strong.

Your choice of course, but there is no disadvantage at all to enabling Wifi calling. None, at all.

I’ve been using wifi calling for many years. Recently I discovered that I don’t hear the callers voice when I receive a call. However, it becomes ok if I turn off WiFi calling. I use iPhone 14 and iOS updated to the latest

You're welcome.