There is ALWAYS an advantage to a receiver first setup. eARC may work fairly well... Even REALLY well. But, not perfectly. At some point you will turn on your TV and it will turn on your receiver when you don't want it to. Or, it will turn something off unexpectedly. It will switch inputs when you don't want it to. This is the lie of HDMI-CEC control that goes along with ARC.
If you just plug everything into all those HDMI inputs that you bought with your A/V receiver, then you just leave your TV on a single input and call it a day.