Devourer, much like Runeglaive needed to, should be toned down.

The Devourer enchantment allows for many champions to do much better in the jungle, champions that otherwise had never seen any action in the jungle. Vayne is a primary example of this. The Sated Devourer's passive that procs on-hit effects makes it so that two autos from vayne activate her Silver Bolts immediately, dealing a large amount of true damage. Some other champions that benefit in similar ways are 1-Twisted Fate 2-Ekko 3-Jax 4-Kayle 5-Caitlyn And all other champions who have on hit effects for their autos.
I have seen all of these champions, all of which, before this item's addition, would have been fairly nonviable (with the exception of ekko). Kayle and Jax in particular receive an enormous buff, as kayle shreds through armor even quicker than before, and jax deals enormous amounts of bonus magic damage with his w and his ultimate.

The addition of this item, obviously, added a lot of diversity to the jungle, something riot has sought after since that period of time where lee sin, vi, and rek'sai were effectively better than all other junglers available at the time. While diversity can be good, these new jungle options are in a similar state, where they are the best choice in most options, and this is solely due to this item and its synergy with their kits. This item shouldn't be removed, but should definitely be toned down, as it has become the only viable enchantment path for junglers.