Regarding the design goals: https://www.planetside2.com/news/planting-a-flag-this-anniversary
Unrelated to the priority system above, we've also disabled the remote-deployment of vehicles at the moment, with the goals of slowing down the pace of deployment around the map, bringing us back to earlier times where terminals had more value as sub-objectives, and vehicles could more easily find gunners willing to hop in. This change is non-destructive, however, and we can return it with relative ease if the design goals aren't being met.
After watching the spawn system play out for a bit, I think we're in a decent spot overall. Preventing quick pulls from actively contested regions (at the very least) might still be healthy though, to reduce the ease of pulling vehicles from the base you're defending just to delete an attacker's Sunderer.