you would need to somehow revert the respecc when the zone is left though, otherwise it would just become the free-respecc zone for everyone
Also, i believe it's intended that you can't just freely adjust your specc to current playstyle. Someone switching from grouped to solo RvR can't respecfor free, just like someone switching from RvR to PvE can't respec for free, and changing that has more influence than simply being QOL