The reward problem is widespread, but GGG only fixes isolated cases. Why not adjust all at once?

List of random Rabbit buffs
Buff name　　　　　　　　　　　 Stats
Fang of the Predator　　　　　　 Always deals Critical Hits
Scent of the Prey　　　　　　　　Hits against you are always Critical Hits
Hunger of the Stalker　　　　　　Item rarity cannot be increased
Alpha of the Pack　　　　　　　　Drops additional Unique Items
Transformation of the Cocoon 　 Dropped items are converted to currency based on rarity
Pelts of the Wild　　　　　　　 　Dropped items are converted to equipment of a specific item class (includes jewels)
Runt of the Litter　　　　　　　　Item quantity is halved
Bounty of the Hunt　　　　　　　 Item quantity is doubled
Decay of the Husk　　　　　　　 Grants no experience when slain
Gluttony of the Beast　　　　　　Grants 200% increased experience when slain
Trickery of the Web　　　　　　　Drops no Gold
Change of the Chrysalis　　　　　Dropped items are converted to Gold

https://www.poe2wiki.net/wiki/Azmerian_wisp

Regardless of context, the answer to "Why not fix more things?" is always "Because fixing more things takes more time and sometimes fixing things that impact more people sooner is better than taking longer to fix everything."