I’d find a volte indicator useful. Maybe even more so on the incoming call notification. That way I could see if the device had fallen back to 2g before I answer. That service has degraded so badly that calls range from difficult to impossible to communicate anymore If I knew before answering I could reject it and call back when I knew I’d be able to talk.
That said, I find I can slide the call notification over and peek at network status to see if it still says 4G while ringing. Not a perfect workaround, but it reduces my wife’s complaining about my ‘nerd phone’.