"We Like Diversity in the Jungle"
makes runeglaive makes sated devourer
makes runeglaive makes sated devourer
And ever since those two items, there's been more jungle diversity...
Or do you remember early season when it was 
?
Now we see
and more. All of which are viable.
diversity isn't always a good thing, sated devourer does nothing but take advantage of solo queue mentality and rewards play against teams that don't coordinate... it adds a "time bomb" element to the game that doesn't need to be in the game
you know what actually FUN diversity in the jungle was? season 3

and some modern picks from today's game like
and new 
THOSE were all AWESOME picks and i actually liked playing against all of these champs in jungle. when it gets to
then the game stops being fun
the idea of sated devourer is fundamentally flawed because it promotes doing things like being very passive and is way too reliable in solo queue. additionally, it destroys low elo because the champs that use it have such a low skill floor that they can win in champ select because uncoordination and lack of skill or game knowledge can completely screw teams. so many of that season 3 pool that i just listed literally can't deal with a sated jg unless their lead is huge
this game is just straight up more fun to play with no devourer. it's pretty much as simple as that
I would say the removal of Magus hurt diversity more than the addition of Runeglaive.
Sated Devourer isn't viable in pro play because carry jungler is not META. In pro play, the jungler needs to help laners get ahead and carry. Pro level junglers get Sightstones like Season 3 supports. Devourer is solo queue cheese.