You are not missing anything. The G2 product is not yet complete for some reason. You can find the IP of the G2 in the cloud interface and log into it… but that is it.
There is no provisioning. There is no remote monitoring. There is no way to sync configurations. If a customer factory defaults a unit, you need to know the password directly on the top of the unit (there is no other way to get in). If you setup a wired or wireless extender, you cannot connect to it without being on-site. If you change any SSID settings in the main G2, it will not provide those settings to the interior G2s. There is no way to pass or untag VLANs in general or to the LAN port. There is no way to have a management VLAN, or to pass a management VLAN to interior G2s.
All that being said, if you configure it right the first time, you will not likely have any issues. They seem to be stable and reliable. I always change the WAN password to match a management password so I can configure the device for the customer. I note the default password in their account. I only put them behind a firewalled CGNAT so their management interface remains inaccessible to public IPs.