What is the point of receiving a pre-DF reward that doesn’t even work in that expansion? The trinket is literally made to remind of the elements and the expansion itself and it is not even worth using it after level 60.
Making it scale to level 70 is how I thought it would work, there is no reason not to make it so since it gives no extra experience and it wouldn’t affect the gameplay in any bad way.
Agreed, it is always good to earn something before the new expansion lands and carry it over while leveling. I remember farming Raids at the end of Mists of Pandaria for the heirloom weapons, that was great content to keep us occupied before the new expansion, everyone was raiding and pretty much without much filtering (as it normally happens)