People are, but probably not together with the dashboard, as they target different usecases.
The problem you have is that the dashboard doesn’t support name_add_mac_suffix, so it tries to connect to the device name without the MAC suffix, which of course doesn’t work. You can either OTA from the command line using the --device option, or try to set the use_address option under wifi to the devicename with the suffix (but that requires you to modify the YAML file for each device, so it kind of defeats the point of name_add_mac_suffix).