I’m just too used to setting up DHCP and including the single gateway address in that.

Setting up a routing advertisement daemon and just letting devices use their (MAC-derived) automatic IPv6 address is significantly different, so I haven’t learned it yet.

It also doesn’t help that I’ve never been under an ISP that provided IPv6 connectivity, so I’d only be able to connect to IPv4 external endpoints anyway, unless I separate got a 6-in-4 tunnel service of smth.