Honestly it would actually be really cool to skyride through those portals myself. Like with Zaralek and the Isle of Dorn zones using zoneflow, the orbis portal tunnels seem like a great place to retroactively implement zoneflow as well.
For added fun idea; if you dismount, you still continue “falling” through the portal, but instead of flying out the other end into Oribos/the zone, you just get spat out as your unmounted self
Seriously though, opinions of Shadowlands aside, there is a level of freedom that skyriding gives the zones, and hitting an invisible wall right before the portals feels like such a tease