I don't mind them adding things that can take a long time (it can take months for beast tribes and FATE items). But I think they should have put the items the FATEs drop instead of the actual mount - some people may need just 1 more item to get the mount and won't need to spend so many tomes (to not devalue their time spent getting their previous items).

That said, I also think all the primal mounts shouldn't be on the menu. What they should do instead is just increase the mount drop rates for older expansions.