Many people have posted problems where they can’t use LTE interfaces for IPv6, because the provider is only supplying SLAAC-based connectivity. Even if ROS allowed SLAAC-based interface assignment, that wouldn’t help the LAN hosts.
I’ve seen in OpenWRT where RA-relay is now a package (I think it’s a userspace daemon though).
Relay is the only viable way to let LAN hosts use an ISP who only assigns v6 with SLAAC+stateless DHCPv6.
(or NAT for IPv6 - yuck!)
The ability to use the Mikrotik as a proxy-based pseudobridge would be quite useful as IPv6 becomes more common, while some carriers lag behind in dynamic addressing because you can still use the router’s firewall capabilities to protect your LAN hosts, and provide LTE based IPv6 to an entire LAN.
