Can Orbi nodes be connected with ethernet?

I’m considering getting an Orbi system to improve WiFi, but have already got Cat5 cables installed between where the nodes would be installed. I presume Orbi would use the ethernet connection in preference to WiFi if I connected it that way - it would nice to be sure though?

Secondly, if I Connect Orbi this way, am I effectively wasting money on an expensive system then not using one of its key functions, or does the seamless WiFi between nodes and similar other functions make it worthwhile? Should I just be using an Access Point or two and configuring them to mirror?

Thanks all