Why is further reducing jungle XP a good thing?

It feels really bad to be actually killing jungle mobs and the game is over by 15 because enemy decided to just permagank. What actually is this role? Nerfing XP more, when you're already 2 levels behind solo by default? Please, sell me on this. Riot has said they are planning to further nerf Jungle XP for next season. Please explain why.
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