At least (and it's still a big thing) it's for our future safety when we'll encounter some loud event that will destroy our hearing (I think that it's guaranteed sadly. Dentists, fireworks, firecrackers, alarms and so on. We live in loud times where nature and evolution did not catch up), or when it will occur because of aging. Tinnitus gets worse when hearing gets worse so at least it could save us from further worsening.
At best it would help by restoring hearing that we are not aware is gone on daily basis and audiogram can't catch and improve our Tinnitus by doing so.