So you agree that there is a problem here. Good. "Whining" would be unwarranted and misdirected complaining. Good to know that this criticism is neither unwarranted nor misdirected.
If the object is to encourage party play, the devs can do that without also encouraging bad behavior.
A 10% boost to those stats is not minor. For a player with 160 accuracy and 2000 HP, a 10% boost is an additional 16 accuracy and 200 HP. That is like wearing an additional 4 Silver Rings and an additional set of Full Plate armor and Mythril Wristlets. That is the difference between killing Dodore quick enough for 2 additional respawns, and only killing Dodore fast enough for 1 respawn.
It is not a "lolincrease", and even if it were, that doesn't justify bad design.