Not only do you have to change every single device to the new network and password but then some items are no longer compatible because of whatever is new in it.
I replaced my old Orbi AC1200 Dual-Band Mesh WiFi Router with the Orbi 370 Series Dual-Band WiFi 7 Mesh (1 Router + 2 Satellites) due to an end of life support email. The router and satellites went into the exact location of the old Orbi. The signal strength of the old Orbi was alway blue between the nodes and were spread out in a "Y" network topology. The new Orbi doesn't show a signal strength unless you are "sync"ing the nodes. Also, the new Orbi keeps deciding that a string topology is better than the "Y" topology that the Old Orbi used even though it will form a "Y" topology for a short while after forcibly syncing to cause the "Y" topology. The troubleshooting FAQ says that this isn't optimum and that I should relocate the router and the satellites so that they form a "Y" even though they both connect fine when one is unplugged. I'm not having any speedtest issues so I guess I'm going to stick with the string topology.
Prior to purchasing this mesh system I had a standard Netgear router. I was very skeptical on well these mesh systems actually work and I am very impressed. It truly covers the 4000 sqft they advertise. Extremely happy with this latest Netgear purchase/upgrade!