The UI is definitely better than it used to be, but nodered can do some more powerful stuff like pulling the html of a devices web ui and parsing data straight from the page when there’s no API to use for example. I used to do that for a solar inverter at my last house.
Now I use it to control my AV switcher that distributes video through the house, it has no native homeassistant integration and only supports things like control4 and RTI so I implemented my own control using their REST API and hooked it all up to buttons and selectors in homeassistant. works great.
Also my home theatre receiver has a homeassistant integration but its terrible, so again, I’ve manually implemented the tcp controls in nodered.