At least for my ISP, SLAAC installs a default route and uses link-local addresses to route traffic (I actually didn't know this would work until I tried with Op

At least for my ISP, SLAAC installs a default route and uses link-local addresses to route traffic (I actually didn't know this would work until I tried with OpenBSD 7.6). This allows the PD LAN subnet to be routed out to the internet. YMMV! edit: I may be slightly misunderstanding, and it might not be needed. Regardless, my router can now ping internet addresses while running slaacd.