@Alexandre. Thanks, the linked article provides answers to some questions I had about AP mode in a clear way. None of the Deco functions lost when run in AP mode are ones I use, so I may just try...

I have a three Deco X60 setup for mesh wi-fi in my home and that's working fine. But I also have about half a dozen wired devices (ethernet) incl a few PCs and a network printer. My ISP is Frontier...