This post is referring to the "super savage" fight that is coming out in 4.1 that you unlock after beating O4S.
A better example would be PVP mounts (as the tiger has been mathed out to take years even if you do hit every single S rank, which is dumb). The issue with PVP mounts is the execution of PVP game modes, not the mount implementation itself. Super savage rewards are not "inaccessible", just difficult to get.