The difference here is that previous sysupgrade images were generated by the installer script as well -- the original idea was to include LuCI (which isn't part of snapshot images on downloads.openwrt.org), but then I decided to include a more complete set of packages useful for this specific device.
Now that the 22.03 release is getting closer and there are now sysupgrade images on downloads.openwrt.org for this device which do include LuCI, I decided to just ship that instead, so we get to test what is going to be in the official release images. This is because I never intended to provide a community build or anything like that, I just wanted normal users to be able to try OpenWrt on the device and find themselves with a Web-UI.
If you want
luci-app-attendedsysupgrade you can simply install it after installation:
opkg update opkg install auc luci-app-attendedsysupgrade
will install both.
Similarly, if you need the full variants of hostapd/wpa_supplicant for 802.11s mesh mode, you can replace the included
wpad-basic-wolfssl with something more advanced which does support that, such as
wpad-openssl (which was included in the sysupgrade images previously generated by the installer script).
Alternatively you can as well just use chef.libremesh.org to generate an image with exactly the packages you like and use that instead.