I have a secondary Internet connection at home, that uses an extremely dumbed-down CPE — like, you cannot make ANY configuration changes to it.

To connect that network to the rest of my home/homelab network, my choices are either a) set static routes on every device on the network (assuming they even support setting any), or b) inject IPv6 routes into the network using router advertisements.*

#HowIPv6HelpedMeThisWeek (and every week for the last 2-3 years)