Is there a reason to not change my router SSID and Network Key? (Nighthawk MR60)

A few days ago my mesh router (MR60) stopped working. Netgear Support assisted me in updating the firmware. During the process of getting the router working again the Tech told me not to change the router SSID and Network Key (password). I was tired and only after ending the call did it occur to me that this (the SSID) is the router name that my neighbors will see and the name all my devices must recognize. So my question is: is there a reason to leave the default SSID and Network Key that is on the router label or should I change it? It seems to me that both should be changed for security reasons. If I do make a change, do I do it through the Nighthawk app or through the router login with my computer?

Thanks in advance for your advice.