Lack of jungle items is hurting the jungle and jungle diversity
I mean riot has always been pushing for jungle diversity and its possible but a lot of champions are pushed out of the jungle because of lack of item diversity that suits them in the jungle or the item is not good enough to keep up with the top tier junglers. There should be a jungle item for every situation for example on the ap side of items
60 ap 7% movespeed - if you want to be a hyper ganker
60 ap 10% cdr +mana - going for a fast clear so you can reach level 6 and potentially your power spike earlier
60 ap + sheen - for those who can spam abilities and really make use of the sheen passive
30 ap + 10 magic pen for those junglers who are strong in the early game with good base damage but poor scaling
Items like these can help diversify the jungle so you can practically play anything. If you want to play amumu and have a fast jungler clear with little to no mana problems go right ahead. if you can spam abilities quickly go for the sheen item. if you want to end game quick go the magic pen route with less ap. Point being that with more jungle items like these it opens up the jungle to almost every champion and this is the best way to make the jungle feel fresh again.
Ideas for ad jungle items
30 ad 10 lethality for those assassin junglers
25 ad + tiamat - for those ad junglers who have a hard time clearing the little monsters can give them a faster clear
65 ad + 10 cdr - for those junglers who just have high ad ratios
TLDR: Riot has constantly been trying to refresh the jungle and have good jungle diversty while only have 1 type of jungle item for each class. More jungle items = more diversity = a fresher jungle
2.0. Less is more. The last thing the jungle needs is more items that will just make it even harder to balance