Ability to configure static routes on the eero defined network. Useful for directing traffic to other devices beyond the default gateway for communication, such as a vpn device.
I work around this differently. The eero gateway is connected to the ISP router (needs PPPoE anyway). It's a double-NAT but I configured the ISP router to place the eero in the DMZ, so no issues (also eero does a pretty good job at forwarding UPnP requests to the ISP router). I have a Raspberry Pi connected to the same ISP router, IP-forwarding enabled and a VPN with some specific routes to bypass geoblocking. On the eero, rather than using DHCP for WAN, I configured a static IP with the "Router IP" of the Raspberry Pi. Note that the Raspberry Pi doesn't do NAT for the default routes (only forwarding). For VPN, of course it will do a NAT as it needs to present a different IP on the other side of the tunnel.